I think this is a bug:

Start a new game.

When you get to the Colony Management screen click on a useable sector.

Then "single" click on a project in the Available Projects list.

Examine the project description (bottom left area). Notice where it has the time icon and next to it says Never? Try single clicking any other project, it will still say Never next to the time icon.

Next click Build. The project is placed in the Build Queue. Sometimes it gives the accurate number of weeks to build and sometimes it still says Never.

If it still says Never, adding another project will (usually) somehow make the game display the correct time to build from then on. Also, double clicking a project from the Available Projects list seems to always list the project in the Build Queue with the build time displayed correctly (it seems to never say Never when you do this...)

However, it always will display the time to build as never when you come to a planet and select a sector and single click a project for the first time.

I think this is a bug.