Practice leads to Carnagie Hall. The more the merrier. Do you understand?
If you practice 2000 hours of violin, you're definetly better off than those that practice 1000 hours.
The same goes to math and reading too. Time spend on the subject is the key.
If you're weak on math, work on the weaknesss, if you're good at math, work on advancement.
There's never a limit on how much you can get from practicing and advancing.