City won't be up turn 40, need 15 turns for the worker, ~16 turns to grow to 4, assign settler , it'll be done ~turn 40. But assuming hunting->AH->archery we'll have archery around turn 35, we need to build at least 2 archers before we can go with the settler, one to defend capital, the other to escort the settler. This'll probably be minimum requirement since we also have to protect the pasture and fp's from barbs, especially pasture is well en route for barbs. Building 2 archers will cost some 9 turns then we can queue the settler which'll cost us ~8 turns if we're at size 5 by then. 2 turns to reach gold for settler to reach gold assuming the escort is already there.
If we're going with 2 archers we need some help from warriors, we'll have ~3, the initial warrior if it doesn't die, once at size 3 we have 4H/turn, before 1H/turn. May need 1 turn to finish that third warrior at size 4.
There is some margin here as i don't know all the numbers exactly, i think second cityll be up roughly between turn 50 and 55. The capital will be strong by that time though so np if the Monty Ragnar team isn't too close.
I wouldn't farm too much fp's from here as i think the fp's in capital's bfc need to be cottaged later.