Opening prep with databases takes up the vast majority of their time. They get their tactical training together with opening prep there, and it's also a tactic or one that's very similar that they may see during the game. Their analysis tends to be with their trainers.
Of course they probably pick up a grandmaster repertoire book or fundamental chess endings from time to time for a bit of "light reading"...
One thing I can assure you they don't do is come on chess.com forums. 
You probably don't want to take that 2nd post too seriously as he probably doesn't train GMs for one thing.
You probably don't want to take that 2nd post too seriously as he probably doesn't train GMs for one thing.
No, this is what they say themselves and is extremely well-known by nearly everyone.
I try to be helpful, and this is the thanks I get? Why on earth you chose to pick out my post for no reason... I was asked a question and answered it correctly, so **** off.
Make me dicko! Anyway, i know it's difficult for a dweeb to take criticism, so you're excused!! :)
different GMs do things differently, so the OP is still well advised to steer clear of your advice.
I only know what Magnus Carlsen does; he studies a lot of theory and played matches. Since he is very interested in chess, he pays close attention to what others are doing to develop their game. He also works on his fitness level, which comes in very handy in long tournaments.
A few years ago, GM Heinrik Danielsen was selling videos with his daily training material. In general it included :
He was also playing in tournaments and reviewing his games, but only shared this analysis sporadically.
Top GMs probably spend more time on opening study (4hrs ? 7 hrs ?), as mentioned above.
Does anyone know how GMs (2500+) train, generally speaking?
E.g. Is it mostly opening preps or do they play practise games, study complex puzzles etc.
And how many hr/day?