A new round of review is created each time a new proof is added to a review stage. At least one round is needed for each stage, but there can be many rounds for each stage.
When a new proof is uploaded for a project or a reviewer makes a decision about a proof, a new round of review will automatically start. Access previous round details from the round history.
For each round, you'll see information listed for events that occur during the round. See when a proof was uploaded for a round, who approved the proof during a previous stage or moved it from a previous stage, or if a stage was skipped. Also see the number of days, hours, or minutes it took for a round to be completed.