This is right at the start of new game. No turns have been taken.
Go to the Colony Management screen.
Select an available tile to build on.
Build any project other then the Market Center on the selected tile.
Build Times according to the build queue:
Basic Factory – 17 weeks
Basic Farming – 17 weeks
Basic Lab - 14 Weeks
Entertainment Network –19 weeks
Select the project from the build queue and then remove it.
(Note: The above steps were done just to gather information on the build times and do not need to be performed to use the exploit.)
The Exploit:
Select an available tile to build on and place a Market Center on that tile. (12 weeks to build the market center.)
Next select the Market Center from the build queue and select a project from Available Projects. Either double click on the project or use the upgrade button.
Here are the new Build Times according to the build queue:
Basic Factory – 5 weeks
Basic Farming – 5 weeks
Basic Lab – 2 Weeks
Entertainment Network – 7 weeks
This issue can be produced with any project that has a build time less then the project that you build over it. I used the Market Center because it has the shortest build time and allowed me to show that each of the other available projects build times were changed.
For what I can see it appears that the new build times are the are based on the number of additional weeks it would take to build newly selected project.
Just one more example in which I can have an Entertainment Network built after 2 turns in the game (right at the start of the game). Select either a Basic Factory or Farming project (17 weeks to build). Select the tile and place an Entertainment Network (19 weeks to build). Press the turn button twice and now I have an entertainment Network on the planet.