What did we ever do without computers? The chart above is a good example of using computers to randomly assign jurors to various days so that the time for a potential juror to sit around with nothing to do is minimized while the courts all have sufficient jurors for their cases. You may want to click on the chart to get it big enough to see.
I was assigned group #318 which the chart told me would report Tuesday morning. Sometimes groups are told to check Monday evening, then Tuesday noon, then Tuesday evening, etc. This could go on all week but in normal runs it doesn't happen that way. Usually after two changes in check-in times, they're usually given a free pass like groups #324 & #325.