Beijing to Singapore

We are flying from Canada into Beijing on Tuesday April 9, 2018 arriving at 2:10 pm. We are then flying to Singapore to board a cruise ship to Tokyo then over to Alaska and back to Canada. Just trying to confirm that we would qaulify for the 72 hour free visa. I haven't booked the flight to Sigapore yet but am understading that we would have to fly out by 2:10 on Friday. Is that correct?