That worked, thanks very muchPlease log off and back on, this resets the timers.
I am assuming, as with everything else in the game, it divides by the world speed.
If a building takes 3 hours to build on a speed 1 world, it will take 1 hour to build on a speed 3 world.
If they spawn every hour on a speed 1 world, they will spawn every 20 minutes on a speed 3 world.