Once you serve, or are not needed, it's 1 year before they can call on you again. I have been called multiple times. Now I automatically take the 6 months extension they let you take. Then when they send the notice, I hope I am not needed the night before.
My new job, was going to be delivering Amazon packages, but after training Monday and Tuesday, today I rode along with a driver. After a couple of hours it was obvious they put unreasonable expectations on them. They are asked to deliver 250-300 packages in 9 hours, with 1 hour for loading/offboarding at end of day.
When I 1st spoke to someone at the company it was "over 100 packages", but I figured if some where multiple packages to the same location, doable. Next person says over 150 packages, etc. Training guy says up to 300 packages, you need to deliver about 25 an hours, some people finish early.