bug report: time in the game is not time in real life. 11-12 seconds in-game for building is about 17-18 seconds in reality. so everything is taking 40% longer than it should.
EDIT: i reached level 10 fort at about the same time as i finished everything else in the game. body clones and exploration are done. another comment says they reached L18 for their fort and still dont have portal. this feels like it needs some balance work. ive got to wait at least half an hour for each fort level at this point and thats with construction research needing almost 300 million runes, and the focus on reducing build time for relics. so ive got about 12 hours? if it needs L20, in which i can do nothing but press the same button every so often. up to this point I was enjoying the game immensely but im honestly not willing to wait that long for even the most imperceptible progress. and thats not counting the above bug making it another 40% longer.
EDIT2: Correction, the hint about building a bigger fort stops at 13, which is a very reasonable point, leaving previous comment for anyone else unsure. the leap to exploration was a bit of an un-explained jump, i only discovered it because i went over every page with a fine tooth comb.