Some notes on what other players have said:
I don't agree with Episcopul. 2 hours of tactical training per day is way too much. First of all, you most likely won't be able to keep that up. Secondly, consistency is way more important than amassing lots of training hours on one day and then doing nothing for three days. In different words: spaced learning beats massed learning, in almost any area. Doing 20 to 30 minutes of tactics per day is already completely sufficient.
I don't agree with Episcopul. 2 hours of tactical training per day is way too much. First of all, you most likely won't be able to keep that up. Secondly, consistency is way more important than amassing lots of training hours on one day and then doing nothing for three days. In different words: spaced learning beats massed learning, in almost any area. Doing 20 to 30 minutes of tactics per day is already completely sufficient.