it depends on the oponent and his strategy how much time you have to spend to win
some are worth 15 minutes, others need 2-4 hours per day.
tell me what would you like to achieve and I wil ltell you how much it will cost.
I believe that full training including teleport, S&S, harvesting, usage of spies, air+land+sea war, logistics, highways, long and short term strategy, analyzing enemy patterns and getting to a 3 lvl of tricks- this could cost aroun 10 000 000 GMs and I am happy to learn you all of that. After couple of test game s 1 vs 1 you will be ready to take anyone down.