10 years

I began the "Assemble the Dragon Banner" quest and after 72 days it rendered as failed with the bullet point "You couldn't complete the quest in 10 years". My game is currently on day 841 so this is impossible.

Well, it's been two campaigns that the main missions expire after 10 years and I'd like to know if it's like this because of how the game is or it's a bugg (it's pretty annoying because I like to go around the map training soldiers and when I'm ready to attack castles and create XD kingdoms) but...

was playing today and sitting in a city while using the smithy, used wait for some time and got a quest failure investigate 'Neretze's Folly' have had the quest for 840 or so days the quest has a auto fail if you dont do in 10 years seemed weird has been ten years and next quest sequence popped...

I've played a lot with this save, was a vassal, but didn't quite wanted to pledge the banner to anyone. I thought that, perhaps I will leave it for myself for a later date. Some time passed and I left the kingdom thinking that now I will finally start my own only to get a few notifications...

Summary: Main quest ends prematurely, hitting "could not complete in 10 years" mark when it did not say there was a limit. It takes a long while to do this for some playthroughs How to Reproduce: Start game, get to the part where you talk to Istiana and Arzagos after getting the banner pieces...