Episodes In A Collection

My wife and I love watching murder/mystery shows, especially those on true crime magazine series. We're recording all the "usual suspects," specifically:
20/20, 48 Hours, Dateline, People Magazine Investigates, The Playboy Murders, and On the Case with Paula Zahn.

We organize all these shows into a TV Collection, which we then use to create a virtual channel that serves up episodes randomly.

My question:
How can I determine how many episodes are included in this TV Collection (and thus available in the virtual channel), so I can track how much content we have to watch?