I have been playing for 6 game days. I am now completely slowed down. I can only upgrade one building at a time, I work on the garden puzzle or the tile puzzle but those are at the point where it takes a day to get a fresh layout.
I"ve done what I can at the Opposition Hideout. Same with the keepers village. So I spend a lot of time upgrading one building, then leaving the game, then returning to upgrade a different one.
There is a lot of dead time in the game for me now. It seems somewhat uneven to me. Research is ridiculous. Archery took me over 5 days, and I can only upgrade as fast as the next resource can be upgraded. I hope it evens out more as I progress in the game.