No commitment.
Reserve time is anybody's guess but should be pretty short if we can backfill people behind you because they need FO's like crazy so expect to fly.
Reserve is a 2 hr callout, and they can make you do airport ready reserve some # of times per month. We also used to have 12 hr long call reserve but it has been gone for 3 months now due to the lack of staffing on the FO side.