A more thorough explanation:

The one-day, one-trial method is a way of selecting and using jurors for a trial. When a person receives a jury summons, they are required to participate in the selection process for one day only. If they are chosen to serve on a trial, their service will last for the entire length of the trial.

This method is used in several states and has a few benefits. It reduces the average length of service for jurors and allows for a larger pool of potential jurors to be called.

John received a jury summons and was required to show up for jury duty on Monday. He spent the day in the courthouse, participating in the selection process for several trials. However, he was not chosen to serve on any of the trials and was allowed to go home at the end of the day.

On Tuesday, John received another summons and was required to show up for a different trial. He was chosen to serve on the jury and was required to stay for the entire length of the trial, which lasted for three days.

This example illustrates how the one-day, one-trial method works. John was only required to participate in the selection process for one day, but was still able to serve on a trial if chosen.