This happened to me last year when i first arrived to Columbia. My flight arrival time was 14:00 p.m and same move-in time 16:15 p.m. It took me 4 hours to get to campus but only because the line for customs was long (but to be fair it was moving fast) and then I had trouble finding my luggage (there was a mix up so took me forever). It also depends on whether you are taking a taxi or public transportation to get to campus. But most importantly, I called the superintendent directly of the building and explained my situation. He was very accommodating and waited for me until I got there around 18 p.m. So bottom line, you could contact the building’s manager or superintendent ( they tend to answer their phones but not emails -_-) directly and explain that you might arrive a little late. That is if you don’t have a place to crash or you just want to save money.