No…

They cannot start a trip on your day off. The trip has to start in your day on and go into your day off. Once that trip ends you are off and you get your days off restored. They can’t call you on your day off and force you to work. From my understanding, they only disrupt days off if there are 0 other people available for the trip.

Short call is a 2.5 hour call out. 14 hours a day. But you are still subject to FAR 117 rules. They can’t really call you at hour 12 and make you fly a trip. Not enough time. Any assigned unused short calls over 2 of them give you 1 hour of add pay. I was recently given 29 hours off during a reserve period. They released me from long call and put my on short call 3pm the next day. Once released you are free from duty till you start short call.

For example, a 7pm short call in SFO has maybe 4-8 flights they can do.

Field standby is 4 hours. After that you are immediately on long call. Right now, it seems to be rare. If on FSB a trip has to start within 5 hours of starting your FSB. So if you have FSB from 12-4 they could call you at 3 for a 4:30 trip. But if you make it to 4 then you are off.

If on long call you get released at 10am on your last day. 3pm if you next day is your one Flex day off.

If you live in base it’s great. If not then it sucks, but so does normal reserve. I know people on the 737 commuting to reserve and they haven’t flown for a month.