The original The SpongeBob SquarePants Movie from 2004 has a runtime of about 87–88 minutes (around 1 hour and 27–28 minutes), excluding any extra shorts that might play before it in theaters.

If you meant one of the newer SpongeBob movies (like Sponge Out of Water or Search for SquarePants), those are in the same general range, roughly 1 hour 30 minutes.

Information gathered from public forums or data available on the internet and portrayed here.