As you know, each minute new creeps will respawn. So during that time you were jungling, then it is a good idea to stack the creeps so that new creeps can respawn. *It won't respawn if there are still creeps at that place.
To stack the creeps, at 52-53 seconds, attack the creeps and make them chase you until the time reach next minute. Letting creeps back to camp early will fail the stacking.
Fight a bit so that they stay for a while. Let them back to camp if the time already the next minute. You will see new creeps respawn there. But if your HP is low, then jungling to that camp can cost your life. :D