In any game, you simply need to win by effectively using the resources that the game provides.
Time is a resource, just like starting gold. Starting with 10K is one game, starting with 2500 is another game. The same applies to the timer.
Wicc, play 20-30 games on Diamond difficulty with a real opponent (preferably an experienced one, not a newbie), not in single-player mode. Perhaps you will change your opinion.