I would say 1 hour, because if you practice
for like 3 or more hours your muscles are
gonna get really sore, and your not gonna
wanna play for a few days. Trust me thats
happened before. So 1 hour or 30 minutes
will be fine. If you choose to go 30 minutes
and you feel you can do more go for it. It
dependes on when you get tired. I usually
get tired around 30 minutes but thats because
i am NOT fit!! At all!!!!!!!!
So it dependes on how much time you can do!(:
Hope I Helped(: