They can hold you longer for three days if you get picked for a case.
I always seem to be .. the lawyers must know that teachers get paid full pay for jury duty, hence they expect we as a group are more apt not to rush a verdict. Hence why both cases I've been on the most any lawyer asked me whats "what do you for a living?"
The only jury duty quip I have though is there needs to be more access to the bathroom, or a speaker in the restroom if your name is called.
One final funny thing: teachers always say "they never close the schools for snow." Yeta few years schools were closed for a hurricane warning, and in 1996 the big blizzard, schools were closed two days. Both instances, the hurricane being my case, the 1996 blizzard one of my co workers ... when schools were closed. courts were OPEN!!
(Yes, there's an irony that everyone finally gets off work, and you have to go in to jury duty)
So if picked with winter weather being what it is, call the court to see if its open, you may surprised.