So, as the title of the thread implies, I'm curious to see whether we could tag on one of these runs at the end of a regular run, as it could be big for carribean federation, mexican empire, chibichan state etc runs as well, you could get an insane golden circle time. This doesn't affect xin dynasty speedruns though, other than getting more development in shanxi, and, in the case of specifically mongol empire speedruns, NUKING SHANGHAI IF IT TAKES TOO LONG TO SPEED UP XIN DYNASTY RUNS. Yes, the idea i just stated is stupid unless you literraly have all day, but it is possible. All this due to the bit that says that you can start the runs after the starting day. Anyway, oddly specific question over.

you can't do anything other than release the nation before starting the run

Ahh, OK. That voids both my xin dynasty and golden circle runs as I developed both while waiting to release, and for golden circle, chained it onto a carribean federation run, in which case the timer transitioned from the carribean to the development section to golden circle. Wait, if you are going to develop the cities , will you need to add development time to the actual run? This clarifies things, but I'm moreso looking for some sort of loophole now, though no anything I'm pretty sure means no developing, and no hiding a sneaky czechoslovakia or Kingdom of Croatia run in there. Wait, now that I think about it, the wording in the rules should be less vague for the releasable formable so we don't get confused on this clarification and don't need to read a forum post to do so. Anyway, sorry for making this so long, and thanks for the rules clarification!