If you have ballet dancers, how much do they do?

[Fathertedismyuncle]

My ds (9) has recently taken up ballet. He loves it. He has now decided he wants to be a ballet dancer. He is currently doing 3 x half hour ballet classes, and 30 mins each of tap and modern. He also does 4 hours of gymnastics each week as well as hockey for an hour.
I have absolutely no clue about ballet/dance. I want to support him as much as possible but also have 3 other younger dc to consider.
How many hours a week do your dancers put in and do you think this will be part of their life in the future?
Thanks

Hi guys, just to clarify, yes I was referring to the balance of ballet to gymnastics. 4 hours is definitely not too much for someone very focused on gymnastics, but for someone wanting to do ballet, I would either bring their number of ballet hours up to match, or trim the gymnastics down. Gymnastics is very complementary to ballet, but only to a certain point and if as is the case here, we're talking about a child wanting to follow the ballet route, it's important to get the balance right.