advance as far as you can without killing a boss, and then try and kill all the bosses as quickly as you can. best my friend and i did was eikthyr to yagluth in 2 days. can add in permadeath for more challenge. could also set a certain day as the 'final day' and then go thru the bosses... i.e. get as far as you can & on day x speedrun the bosses.