Last plays we had, it took around 2-4 hours to NOT finish the game. It might have lasted 1 or 2 hours more but we had to quit.
I would compare it to Talisman - if you have bad rolls, it can take forever to finish the game...
But take this with a grain of salt - I play this game occasionally, maybe once or twice a year...
Thanks. I also was thinking it will cost more than 90 minutes. Maybe itsn't a game for my group.