Changing to building tower in the end is a good idea tho. I think 0:530:55 is the fastest time possible, but not gonna grind for that. Getting the conversion is around 1:30 igt (45s RTA) and getting your way to the wonder take around 810s igt (5s RTA), placing house next to the wonder costs around 12s igt (1s RTA), the catapult's stone will take around 35s igt (1~2s RTA) to drop.