It varies a lot from state to state as to how much/long you have to serve, and how much the state/court has to pay you. It also varies a lot as to what will get you out of it.
The 1st time I got called, it was for 10 days, they paid $5 A DAY!!!, and I didn't turn in my time right for work, so I got gypped there, too.
The next time, it was for 5 days, but still only $5/day.
Now, it's one day or one case, whichever comes 1st, they pay $10/day. If you don't serve on a jury (get "impaneled"), they can call you back in a year, if you do, it's 3 years before they can call you again.
I got called in June, which would have been impossible this year, all I did was call in to a recording machine, tell 'em why I couldn't serve, and they didn't call me to tell me, get in here anyway, so I guess I'm ok for now.
When I first heard of the one day/one trial thing, I thought it was the best idea since sliced bread! I'm glad they started it in CA.
I did sit on one trial, got questioned but excused for another, mostly just sat around feeling annoyed and sorry for myself the other times I had to serve. It can be very interesting, it can also be VERY boring. Those lawyers really like to hear themselves talk. And the concept of 25 words or less has never crossed their minds.
If your facility pays you, be sure you keep careful track of the time you are at the courthouse. If they have a time clock, use it!!! If they have you come in late, or leave early, call your boss and ask if you can come to work, or use some paid leave--make sure you get all the hours you're supposed to have, either at court or at work. If it's downtown, try to use public transportation to get there, so the parking doesn't cost you a fortune. Bring a good book, crossword puzzle, etc., so if you have to wait to go to a courtroom, you don't have to watch soap operas or Jerry Springer. Be on your best behavior. Wear comfortable shoes. And don't be surprised at some of the inane stuff that gets taken to court!