That, uh. Well, on this planet... Maybe... Two and a half years? In this separate universe...

[He just gives another sheepish smile.]

A while. But I'm one of the exceptions to the rule. I've been here longer than most, so you don't need to super freak out at my answer! There's a chance that you'll be home sooner than you think, and whatever happens, your home universe won't end up being without you.