Much like the time it takes them to shed, their movements can be an individual variation. As long as they are pooping, than you're good. If you think it has been a long time than handling them and gently massaging down their bodies might help things along. Usually they won't need that. Also, when they shed they also usually poop, due to all the twisting and turning.
It is recommended that you wait 48 hours after feeding. That is generally how long it takes to digest the food. Handling too soon can risk regurgitation.
Don’t forget to review the Ball Python Care Sheet for more information and any reminders.