WiS typically won't allow replacements for abandoned teams until two weeks have passed since the guy's last log-in.
Commissioners should be ready to fill that spot the day it's permitted. It usually takes an hour or less to find a replacement, but sometimes it can be a few hours or more for all the necessary support tickets to be filed and answered to hand over the keys to the new guy.
Remind the commissioner in world chat to fill the opening, because he might have forgotten. After that, the ball's in his court.