@Bhumika The guest checked out on time on that day.
But we prepared a different scenary:
-Before he checked out 1 day, I sent message remind and check out late fee is $5/hr.
-I stayed in the room next to him, shared washroom.
-In case he check out later than 4 hours, I will call Airbnb to ask for help and let him know he has to check out within next 2 hours, we will call police.
-We also warn him we don't allow parking on our driveway anymore after 6 hours check out late.
Luckily he checked out. But after that, he report for some unreasonable things to get refund, but we discussed with Airbnb and don't refund him any penny.