Ever try to paint interior doors? You think it'll be a quick afternoon thing, then you're waiting two days for the second coat to really set. People just don't get how much time stuff needs to sit.
Ugh, that drying time is the worst. Even with quick-dry paint, if the humidity is high, the door stays tacky forever. I learned the hard way you have to check the weather forecast before starting, not just pick a free weekend.