I'm looking for a 1 hour celeste run to learn the route with and it is taking a long time to manually go all the way back. Is there a way to search for a specific time?

Go to page 17 https://www.speedrun.com/celeste?h=Any&page=17

There is no way to search for a specific time. I'm not entirely sure why you would want to do that. Learning from probably-outdated 3000th place runs just because they got a specific time seems like not the best way to learn a game. Maybe go with one of the tutorials instead: https://www.speedrun.com/celeste/guides