5 timing for starting greening. you need to factor in A. how well your engine is performing B. how many points your opponent has acquired C. the status of supply piles and D. where you are at with regards to the reshuffle/how fast you are cycling your deck.
I feel like understanding the late game has traditionally been the hallmark of graduating Iso levels:
You get to 20 by understanding Dominion has a distinct late game with its own strategy.
You get to 30 by understanding precisely when the late game starts.
You get to 40 by understanding that the game has a continuous, dynamic flow, and there's no such thing as a distinct late game.
e: welp, I'm responding to a really old post. Guess that's what happens when I don't read threads very often.