OpenStax
Open Stax: Catherine Schmidt Jones: A Guide to Great Home Music Practice
Offering good tips on practicing, this site goes into some detail on how to best use your practice time.
OpenStax
Open Stax: Catherine Schmidt Jones: An Example Intermediate Horn Home Practice
If you are a French horn player, you may get a good idea of how to practice from this resource. It provides general ideas of what your practice routine should include.