Ridiculous question.
Tactics

No one can give you an accurate estimation of that. However, if you have the time, do it and let us know afterwards!
if i practise tactics for 2 hours a day for 2 years im 1420 now how much will i be
You will be in, like an athlete, excellent tactical shape. However, you will most probably be at a rating somewhere between USCF 1600-1800.
In order to reach USCF 2000- 2200 it will be another 2-3 years of building an opening tree (which will be built automatically by the software that you have purchased along with a database of 5million+ games in pgn), an opening repertoire, and understanding/becoming proficient in those openings, in rated standard time control tournament games. In addition you will have to become an expert at endgame technique which will require alot of study and practice.
Good Luck in becoming a 'professional gunslinger' (a very srong player)
if i practise tactics for 2 hours a day for 2 years im 1420 now how much will i be