The first time I got called was to state district court. The judge at that court tried to do all jury things on Fridays. So you had selection Friday, and if you got put into a jury, you would have to go back on a different Friday for the trial. I got selected for a jury (everyone who showed up got put on at least one jury) and had to go back on a different Friday later in the month.
And - they never had the actual trial. Turned out it was supposed to be the trial of a guy who allegedly was beating the crap out of his girl friend, and when the neighbor lady tried to intervene, beat the crap out of her, as well, for a bonus crime.
So everyone is at court - the cops who arrested him, the judge, the jury, the lawyers, and the witnesses (the neighbor lady was there with her husband and what looked like ten kids of various ages).
And the guy had skipped town the night before, so no trial, and everyone got to go home.
You could tell the cops were mad. They wanted to nail that asshat!
When I got called to county court, everyone had to show up an unGodly early hour for jury selection in downtown Ann Arbor, where parking is well nigh impossible. They had something like ten trials scheduled to go - but then they settled 6-7 of them and only the first few people to have their numbers called had to be jurists. I escaped, and went home for a long winter's nap.
And I got out of work for a day for that one (Fridays are my day off, so I was not able to get out of work those two Fridays for district court).
I was really lucky - everyone else I know who has been called to county court had to do at least one trial. One of my firends had to be juror for a case where a little kid had been killed in a car accident, and it ripped her up. Another got a case where a guy got drunk and high and tried to go parasailing on a local lake that is lined with tall trees and filled with logs and islands and penninsulas covered with tall trees. Of course, he ended up breaking nearly every bone in his body, and tried to sue his buddy the boat owner. My friend told me the jury laughed him out of he courtroom.