Ive easily spent 4 hours sprucing up my base lol, my progression has been weird since i found the delani base very late and i just unlocked the core building for a base, i only had scanner rooms for like the first 12 hours lmao. I literally found the alien bases before the delani base, only through an alien portal did i find the island with the delani clues.

My base went from a single scanner room + vehicle bay with only solar energyr, to a full fledged 5-6 rooms base with alien containments+nuclear reactor+water filtration+ storage rooms+ bedrooms after i found the delani bases lol