I've been called 3 times so far. The first two times I was there pretty much all day. The third was only a half day.
What you do is wait mostly. If there is a jury case that will start that day, the lawyers will ask the potential jurors a few questions and weed out the ones they don't want. If you haven't been picked to sit on the jury, you may go back into the waiting area and possibly go through the questioning process again if there is another jury case. If there is nothing else on the docket for that day, they will excuse you and that is the end of it.
Bring a book or something to keep you occupied. Once you get into the waiting area, you can't leave till they dismiss you.
Your teacher may have been called for a grand jury. That usually lasts a month IIRC. Never been called for that myself.
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