Night time crappie fishing

I've been getting on my local lake around 8pm anchoring over a drop-off from 15'-32'dropping my green light overboard and using jigs.
Most times it's small throw-back fish, but occasionally a keeper comes along.
How long y'all stay before moving?

At night I usually go 30 minutes before we bail. Daytime, max 10 minutes.

Never put a time on it

30 minutes, then off to the next pile.