Posts: 5,640
Threads: 30
Joined: Apr 2009
If you're literally only worried about the time to the third colony ship, and nothing else matters, then:
1) You don't send any pop to World #2. This is a terrible idea. I generally keep the capital at 40 pop until the 2nd world will hit 1/3 of its pop cap.
2) A factory at the start pays for itself in 15t for non-Silicoids and 10t for Silicoids. So when you'd finish the col ship in that length of time, switch from factories to the colony ship (including the impact of population growth - 16/11t on the build order is probably about right). But that massively slows you down for any future production - I'm usually looking at decades of the capital spitting out colony ships. 6-7t usually works fairly well for me for the colony ship. This is usually around 120-140 factories or so. I'm also much more willing to send pop that are over the factory cap than under, for obvious reasons. If you're regularly sending pop that would be working factories early, you probably built too many factories.
My micromanagement trick for colony building is this:
Let's say the capital would take 5t to build a colony ship. I'll set the shipbuilding to be one tick BELOW 5t to build (so the highest 6t option), and the rest usually on factories that I'll grow into (although sometimes research makes sense). This has to be adjusted every turn. Then on the last turn, I make sure to move the production back to finish the ship in the original 5t timeframe - usually that's a 1-2 tick move back. Basically, this ensures that the world develops as much as possible without delaying the next colony ship.
Note: The 15t/10t payoff rule (which changes as you get cheaper factories and better cleanup) is very relevant when you're stuck building a Huge Colony Ship because you need Reserve Fuel Tanks and don't have the minimum techs to do that on a Colony Ship - it can be better to spend a turn on factories because they'll pay for themselves before the ship is done. Usually when you are forced to build a Huge Colony Ship, getting that done ASAP is a huge priority as the last thing you want is to spend tons of resources only to lose the world by a turn or two.