This is NYC... they have to pay bills, I can't even begin to imagine 92 minutes of commcerical free music as a regular clock, that's an hour and thirty two minutes of music on a real station, with a signal, and BIG bills to pay.
Not to mention, they are already beating music to death during this gimmick launch, I can't imagine doing it regularly too. Yesterday I read as someone said Love Lockdown was being hammered, so I listened and BANG four times in 3 hours and 45 minutes. They do realize he has newer music out right? Anyway, with 92 minutes of music, that'd be their top songs twice or more within one music sweep, depending on when on a clock the sweep started.
This is NYC, most stations have an abundance of clients and commercials, even the ones with mediocre ratings, so I doubt they'd change the format and then want to make less money, because they aren't allowing for commercials.