How long do you leave it before the event is archived ?

Like all things, people do it differently but 30 days is a good measure.

Myself, I do a sort of two stage approach.

I Temporary Disable the Event, using this to nudge people to complete logs and retrieve TB's in the Event Inventory - I do this about 2 weeks after the Event.

Then a week before archive, I make an announcement that the Event will be archived in a weeks time, for cachers to complete their logs (they can still log after an Event has been archived) and remove TB's which is more important, as TB's that are still in an Event when it gets archived, become orphaned i.e. they are not in a person's or cache's (Event) Inventory.

So after four weeks, the Event is archived.

This is how I do it, others do it a lot quicker and some are still active 2 months afterwards!