Did you look at the Channels DVR log?
You can view it using the DVR web admin UI at Support > Logs
Normal daily guide downloads look like this where it fetches 6 hour blocks for 16 days
2023/08/04 09:21:00.997352 [DVR] Fetching guide data for 128 stations in USA-CA54023-X @ 2023-08-04 9:00AM
2023/08/04 09:21:04.149209 [DVR] indexed 891 airings (128 channels) [1s fetch, 1s index]
2023/08/04 09:21:04.777743 [DVR] indexed 37 movies (16 channels) [0s fetch, 0s index]
2023/08/04 09:21:04.795587 [DVR] pruned 114 replaced airings in 0s.
2023/08/04 09:21:05.653268 [DVR] Fetching guide data for 128 stations in USA-CA54023-X @ 2023-08-04 3:00PM
2023/08/04 09:21:07.837136 [DVR] indexed 883 airings (128 channels) [0s fetch, 1s index]
2023/08/04 09:21:08.495695 [DVR] indexed 57 movies (25 channels) [0s fetch, 0s index]
...
2023/08/04 09:27:43.216279 [DVR] Fetching guide data for 128 stations in USA-CA54023-X @ 2023-08-20 3:00AM
2023/08/04 09:27:48.264027 [DVR] indexed 1017 airings (128 channels) [3s fetch, 1s index]
2023/08/04 09:27:48.897830 [DVR] indexed 34 movies (18 channels) [0s fetch, 0s index]
2023/08/04 09:27:51.108984 [IDX] Pruned 0 expired groups from USA-CA54023-X in 312.849µs.
2023/08/04 09:27:51.247665 [IDX] Pruned 3690 expired airings from USA-CA54023-X in 129.566643ms.