There are lots of factors that effect the amount of xp per floor and per hour
Whether your party has 5 members
Whether those 5 members are experienced or terrible (this makes a massive difference)
What floors you are doing, and whether small/med/large - complexity 6 ofc
but it is is veryhard to say the xp/hr and how long it will take to get the certain lvl because there is so many factors that effect dung.