i'm wondering what counts towards this badge. i'm assuming leaving your game on sleep mode overnight like i tend to do doesn't count, but what about leaving the game open with your mayor idle in your house or somewhere? and does time travelling effect it? i rarely TT, only if i simply must move a villager out.
TTing wont make a difference - i time traveled up to 2050 and my tree didnt grow at all. im not entirely sure if just idling with contribute to it, but im assuming it will. i suggest staying active and doing something in the game a majority of the time though, just to be safe