Sunnyside

Does anyone know how long NJT trains at rush hour sit on platforms 1-4 before returning to NJ?

Also, how many NJT trains that are not on 1-4 return to NJ without going to Sunnyside?

Don't have exact answers but an example...

Train 6616 the MTD train from Dover arrives at NYP at 8:26. I believe it goes back out at 8:50 as 6617.

And best I can recall, any train I've ever been on that doesn't stop on tracks 1-4 always has an announcement that it's going to the yard. (That's with respect to M&E trains, can't say for Coast Line or Corridor ones.)

Typically about 20 mins, 3 trains an hour on a stub-end track.