10+ hours, on 500th floor the enemy lv hits its peak lv 999 so it doesn't become more difficult, technically i look for buffs from vending machines to increase ATK AGI and CRIT, these buffs stays with Beatrice through out the run so in case i get buff HP/SP buff but a debuff for any of the other 3 i would simply retry from last auto saved point, also i think i have all damage buffing skills add to the fact that playing for a while lets one know how to deal with different situations, got to floor 1200 two days ago and bored with it thanks to the game lagging