“[Burt] is one of the best parts I've ever had in my life," he said to EW. "I don't want to leave it behind until it's run its course or the story has run its course.”
Mike says that he made sure he could stay on Glee before accepting his new part. "I would not have taken this job, as much as I like Family Album, if they prevented me from continuing as Burt Hummel. I would show up to Glee every day. It's a really thrilling place to work."
The reason he can do both shows? The forgiving schedule. "Part of working out this deal was to say that if Family Album gets picked up as a series, I will still be able to do at least six episodes of Glee. That doesn't mean only six episodes. Only [executive producer] Ryan Murphy can ultimately tell you where he wants this to go."