If you are lucky and start trying to get him to move now, it should take about 10 minutes?
But I forgot to tell you talk to him first, THEN TT 6 days ahead. If he doesn't ping to move, talk to him again, and TT another six days. So basically talk then TT. When he does decide to move, TT day by day until Isabelle says someone's leaving just to make sure you don't lose him.