It depends ENTIRELY who you do dung with.
If you do dung on 117 you should only expect to finish 1 Large an hour, maybe having a bit of time left in that hour to find a new team.
If you dung on 148, you might be able to finish 2 Large floors in an hour or 60-70 mins.
If you dung with 3b0, you should be able to finish 4 larges in 60-70 minutes.
Now for the XP:
From a large my 102 Dung acc typically gets 90-100k XP (more if it is a high Occult/Warped).
So, if I were on 117, I would get up to 100K XP an hour.
On 148, I would get up to 200K XP an hour.
But if I were dunging with 3b0, I would potentially get up to 400K XP an hour.
NOTE: This is all entirely dependent on who you are dunging with, as I said at the top. If you had a decent keyer that knows how to utilize the people in their team, and not let people idle, then even a 117 team can finish a floor in 30-35 minutes.