CELLO PRACTICE TIPS
It takes time (and patience) to build up strength and stamina to play the cello, below are some general guidelines for practicing:
To prevent injuries, warm up and cool down exercises can be provided to assist in creating healthy practice sessions.
Practicing is most effective when it happens regularly. Therefore, it is better to practice 4-6 days a week for shorter periods of time than it is to practice once or twice a week for longer times. This is because your body and brain need time to recover and process the intricate movements that are part of cello playing.
It is also recommended to plan some rest days - just like conventional athletes, musicians use and work their muscles intensely. Your body will benefit from an occasional day off, which is why ideal practice routines don't typically exceed 6 days a week!
Helpful article from the Bullet Proof Musician: How Many Hours A Day Should You Practice?