Is it okay to have a hobby of guitar hobby and PC MMORPG online games?

I retire and live 8-12 hours daily in my free time. Is it good to have a guitar hobby and online MMORPG hobby since I retired? I practice guitar 8-9 hours weekly, and the MMORPG I am trying to find which one I should go for, like SWTOR, Guild Wars 2, etc however I can only devote 1-2 hours max.