how to efficiently study your chess hero/model
Play through a couple of games, if you're studying Tal maybe also study a positional(ish) player like Botvinnik. Try to refute Tal's ideas to improve your defensive skills. Some of the greatest players had a defensive and solid style.
Don't use the engine until you've exhausted all other alternatives, if you don't understand a line maybe play through it on a physical board and think about what each move does.
My question is how long/deeply should I study his games to get the most out of it. I started by doing 1 game per 1h30-2h, each time asking myself ‘what would I play here?’ Do you think it’s a good approach and if so should I do it both for me and my opponent?