There are
972 mi
from Gainesville, FL to Sayreville, NJ
That's the driving distance. It would take 18 hours 36 mins to go from Gainesville, Florida to Sayreville, New Jersey.
The flight distance (direct flight from Gainesville, FL to Sayreville, NJ) is 871.16 mi.
972 mi = 1,563.88 kms