A normal jury day will begin between 8:00 and 9:00 am and will end at either 2:30 or 5:00 pm. Once the jury is in deliberation, the times may vary.
Yes, there will be breaks during the trial. Depending on the trial judge, the trial schedule will run from 9:00 - 5:00 with 2-15 minute breaks and an hour lunch or the trial will run from 8:30 to 2:30 with 2-20 minute breaks and no lunch.
Occasionally, a trial will extend past 5:00 pm in order, for example, to complete a line of testimony.