regnad kcin said: "I thought most lead contracts were typically for a year, subject to the show remaining open, of course. If that's the case, Groban is probably signed through October. Now that reviews are out and positive, it shouldn't be long before tickets are on sale past April."
...but if he signed a six month contract, his departure date would be in April, right? Considering it's his first Broadway outing (and an unconventional production), it seems reasonable that his initial commitment was limited. By all reports, he's enjoying his gig and has garnered praise, so I would assume an extension is a given (at least through Tony season!)