I've participated to a dozen jams in real life and twice as a judge, and there's always a judging time of about 5 minutes, and can stretch a bit if the judges are hooked. It's my first time doing a gamejam online, so I have no idea if this is standard? If you ever do another one of these it could be added in the rules to be clearable in under 5 minutes for example. It helps games stay focused and polished instead of overstaying their welcome, but mostly it helps the judges' sanity!