90 minutes is common if you work in NYC and have a suburban home.
It takes me about 2 hours and 10 minutes from the door of my apartment to the door of my office. I live a 10 minute walk from the train station in PK and work a 10 minute walk away from Grand Central.
There are probably a few hundred people at the train station every morning, from much farther away than I am, who probably have to take another subway to their job once they get to Grand Central.
It's bananas and the only reason I'm doing it is because my fiancee is in school in Poughkeepsie. I always wonder what the other people's reasons are.
Now I have a house in Staten Island and it’s still 50 minutes - though I can cheat a bit by driving to the bus. It’s actually a 15 mins walk, but I don’t mind it.