I’m with that other guy though. The RNG can screw you over way too suddenly for a Roguelike where the runs are that long. There’s been a real slew of too long rogue games lately (this, Darkest Dungeon, They Are Billions). That’s why FTL worked; around 2 hours should be the limit.
The scenarios themselves should be about half as long. A big part of that is having to sit through the encounter & invasion animations.