Oh somebody else tried this as well nice! Yea I think it took me like 15 minutes (Pretty easy to do fast when the game takes 2 minutes from start to finish) and 2-3 retries do to losing cubes out of the map or through walls when I decided I wanted to do it.
Edit: I decided to go back and try it again and did it in 4 minutes due to one of the blocks losing its ability to be grabbed for a while and me having to push it