Looking at it again, it appears to only be 6 hours of guide in the xml file that was generated over 2 hours ago. So that lines up with you seeing only 4 hours.
I use a cron job (Synology Task Scheduler) to keep my Pluto guide up to date.
You can refresh the lineup and xml using curl commands.
Looks like his site is updating right now.
Yep, new m3u8 and xml files
I noticed Pluto added 50ish some more channels since last i looked at my Lineup.
Seems they be slowly adding in many that Samsung has. Like MotorTrend FAST.
Though, a few, are named the same, have slightly different programing.
I just refreshed the xml, no change for Samsung, no further guide data past 7pm my time.
The new xml file on his site should get you guide until 9pm your time
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This is why I use the epg from channels instead of the Samsung EPG otherwise you're at the mercy of stuff like this. Thank God I don't have to configure (babysit) much after I map out the data...
a refresh after 4pm my time, gave me to 9pm. But still, i do not understand why they have 5hrs of guide data, and all the other data is just wasted as being in the past.
How do you mean? These are specific online streaming channels, FAST i think they are called, and each service may stream different programing even if it is the same Channel Name.
How are you mapping these custom channels to a Channels EPG source?
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Go to each channel individually and look up the name. Gracenote also has data on FAST channels (well...not all of then as some of them are just on demand programming on a loop but most)
The official Samsung TV Plus app does not have a DVR function, so their API only provides about 6 hours of listings.
The bulk of the FAST channels on Samsung TV Plus are pretty much the same linear feeds that TCL, Roku, Vizio, Freevee and others have, so Gracenote has listings for many of them except for their self programmed exclusives like Conan and Pluto's "stitched" channels like the BET, MTV and TV Land branded channels. (The Nickelodeon branded channels from Pluto are programmed as a linear feed, so they have Gracenote listings)
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Well, the ones i use, are not the same between Pluto and Samsung, for example, BBC Earth, Top Gear, Jack Hanna Channel. I compared them and different programing.
I click the pencil icon next to the channel to edit its mappings, and all it pulls up is the 2x xmls that is loaded into channels, the one for Sasmung and the one for pluto. How does one map a individual custom channel to a "Gracenote" source?
I have only ever edited OTA channel mappings, and had a drop down to show ota or cable line ups.
You can't really compare Pluto to the rest of the streaming providers like Samsung, Vizio, TCL and Roku as most of their entertainment channels are "stitched" via self hosted VOD clips. The rest of the providers mostly ingest linear feeds directly supplied by the FAST programmer.
Where is "Gracenote" to look up guide data... i did a search and find various pages, but none that allow me to search for program listings, alike to TvDB etc.
This paid service?
or this
Gracenote in google pulls up this site
I have seen Gracenote mention many times on here, but never a link to search its guide my self
like this thread
Gracenote is the guide data supplier used by ChannelsDVR, you search for the station by name the same way you can for OTA channels and manually map the Samsung Channel to one of Gracenote's entries.
Not the case (as noted above, NZ time):
Looks like the XML is being regenerated about every two hours. Several people have already pointed out why there is only 6 hours of data in the XML and how that reflects in the Channels guide--as well as potential workarounds--so I won't repeat all that. With hourly reloading of the XML on my side, I don't seem to have a problem aside from the limited number of hours available. 
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This i know, but how does one acces that source? Is it private? API only thing?
One can go to TVdb or MovieDB etc and access their database outside of Plex or Emby etc. And there is posts about metadata matching using tvDB in Channels before.
For custom channels via m3u, far as i have understood it, the only metadata for guide input is through external xml, so I am not seeing how the built in Guide selector used for OTA and TVE works for this feature since it works by zip code selection, which is not applicable to these FAST channels.
The option to "Change provider" only give me those zip code provided options "OTA Lineup or Digital Cable Lineup, or "Existing" XML/X-M3U, or Custom URL.
this is what comes up when i try to channel mapping for a channel, and searching for the channel name only searches the linked to xml:
What you stated meant to me that you mapped this not to the Samsung XML but to Channels own Guide, which uses Gracenote... How do you do that?
If the xml is regenerated every two hrs and has always 6hours of future data, then, at any given time, at every 2hr refresh Channels does, it should always have 6hrs of future data. But it does not, often only showing 2 or 4. Even going overnight with no data.
I checked my ad blocking DNS and any firewalls, the link is not being blocked, and i can manually open the xml live, so that not the issue.
Perhaps that url is limiting pull request per ip address?
I have not seen any useful "Potential workarounds" posted.
Other than one user said they use Channels Guide data, not the Samsung xml... which puzzels me.
Edit: The App goes to 5am for data. so 12hrs data. I just went browsing the threads about Samsung and other sources. The source says it is scrapped from the server. I noticed the public url for Samsung TV Channels site. That public site is only showing 6hrs data, so i guess that is the why it is limited to just 6hrs. But still not explain why the xml is not always loading the 6hrs future guide data reliably. Feels to me is a scraping issue.
EDIT 2: Oh. The built into the TV "TV Guide" that also is Samsung TV Plus channels in it (different UI), that also will show OTA stations, if u have antenna hooked up. Has 48hrs Guide Data for the same channels that the separate app has only 12hrs for.
{Samsung sure is a MESS in this aspect, with two very different apps and UI's fighting each other. Single press of up on d pad or a channel up button, you get the Guide UI for the Samsung Channels TV Plus app, long press the Channel up button, gives you the TV's native Guide Ui, and that is the only one that has the OTA channels, but also mixes in the TV Plus ones. } Why i really like being able to just integrate Samsung channels into Channels DVR and never have to deal with the TV's apps.
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I'm guessing here since I don't use Samsung, but provide the lineup m3u8 to your Channels DVR custom M3U source URL https://i.mjh.nz/SamsungTVPlus/us.m3u8
and leave the XMLTV Guide Data section blank?
I would think you can then map the channels like you do for OTA.
True, but I keep seeing articles about Samsung Smart Tv's being able to record like a DVR. Just insert a usb stick.
Only thing i find official is form the AU Samsung site. (so may be only a region based feature, and only on certain models)
I tried it on my tv, and i do not get any such options to record or Timeshift, in either the TV Plus app or the TV's native Guide Interface.
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