I know this effect has been around a while but I have seen little to no discussion of it on the forums. Wiki link to the ship module in question below.

http://galaxylegion.com/wiki/index.php/Litheor_Tetractic_Crystal#Mission_Reward_Artifact

The important part is this



If used properly by a person who generates at least 1 terraformer every 2 days on average, preferably more for more project planets, it can create a small but noticeable net increase on the production given by the planet during it's construction phase up to and including 22x. In order to take advantage of the boost at 22x you would need to stall at 14x until the requisite crystals/boons/resequencers are gained to make the planet 20x in one fell swoop, however, doing that is likely to cause an overall decrease in a persons artifact production over the same time span.

Anyways I am rambling here. Do people tend to take advantage of the possible benefits of it, or mostly ignore it?

i suppose a better question would be if someone has a junker planet with stealth screen and they make that a project, and use multiple terras on it, do the effects stack? add together? extend the day? or just do the normal 2day thing?

Answered this for myself the other day. Use multiple terraformers on the planet in a row and only the most recent version of the effect counts so 2 days from the time the last terraformer was used the effect expires.

If the effect is already active, using a new terraformer does not restart the timer on it.
i.e. if you have 3 hrs left on the Litheor Crystal Focus effect, after using another terraformer, it will still have 3 hrs remaining.