The length of each trial varies depending on the type of trial, the complexity of the issues involved with that trial, and how long jurors are expected to spend in deliberations. Most trials are completed within a few days to a week. However, occasionally there are trials that may last more than two weeks.
During a trial's jury selection process (which is also known as voir dire), the judge and the attorneys involved with the trial will indicate how long they expect the trial to last. Judges are aware that long trials may be difficult for some people.
It will be your responsibility to let the judge know if it may be a serious hardship for you to serve on a long trial. Please be patient during the jury selection process, because other potential jurors may have similar concerns about time.