Well, I came across it while I was doing something else trying to merge a few mods together.
It's tough being a complete newbie but no one wanted to help out. Anyway, I feel your pain of not being able to find where something is. I believe what you're looking for may be in the SquadXXXBomber/Combat entity files (where XXX is the race.) Inside, I see a fighterConstructionTime string that may be how many seconds it takes to build, and what you might be looking for.
Ahhhhhh.... You are Wonderful!! That is it!! Also... yes I understand about being a newbie... im a newbie, by about 4 weeks now.... or is it 6 weeks? something like that.. haha.. but i have felt like i was living in the entity files after awhile.
Thank you and when i make some cupcakes you will get one!