For pre-party cleaning, it depends on the condition of the venue before the party even starts. If it's already in tip-top shape, then it would only take approximately three hours. But if it needs much more work, of course, it would take longer. Post-party cleaning also depends on your venue's condition after the event, but you can expect for it to take longer than pre-party cleaning because of the party rubbish and remnants that weren't there before.