*Sigh*It's really simple guys. If you have say four factories, and build 4 frigates of the same type, then each factory will prepare one frigate at the same time. All 4 frigates will pop out after the build time for one has elapsed. One frigate will come out of each factory. If you build 8 frigates, then you will have 4 pop out after the build time for one, and four more will pop out again after the build time of the second "one", ie: 8 ships in the time of two, due to four simultaneous productions.If you build four different frigates, one frigate will still begin production per factory at the same time, and will arrive completed after it's standard production time (as per ship). The kicker is, they all started production within a couple seconds depending on how fast you clicked the queue, and they are all running their countdowns simultaneously. That's all there is to it.The build times are static, unless you have abilities or research. What changes is: how many vessels can be under simultaneous production. The answer is: one per factory.