Feasibility of Philly to NYC commute if 3 days per week?

Hi,

I received a job offer for an opportunity that is a significant promotion and raise at a good company. I can't and don't want to move out of Philly. If I move near 30th station and the NYC office is close to Penn Station, how feasible is this commute three days per week? Does anyone else do this two to three days per week?