SM Cathedral and Armory give under 10k experience a run and a very quick 5man spell cleave group can do them in 15 minutes. A regular group or an inefficient spell cleave group will take significantly longer. It takes 50k to 80k experience per level in the 30 to 40 range. Even the most efficient spell cleaving group can only get one level in 2 hours, and a less efficient group and do it in 3 or maybe even 4.
I found when I did it that I was getting about 7.5k experience a run, so if I could do 4 runs in an hour that would be 30k exp an hour, which is roughly a level every 2 hours. But each group was hit or miss, some groups were 25 minutes every run, some groups could get a run done in 15 minutes but then the next run is 22 minutes because someone has to afk for 5 minutes etc. Either way, consistent 2 hour levels is a bit of a pipedream.
But even if you could get 2 hour levels, multiply that out over 10 levels.... 12 hours farming the dungeon was actually generous
and that's not just "running SM". Running SM with a normal group is pretty fun, but it's much slower than efficiently spell or melee cleave grinding it.
When Classic first went live, there was a bug that raids weren't reducing experience properly, so people were going in with 10 people and clearing in 5 minutes and getting 50k exp per hour, so it was faster then, but that hasn't been possible for like almost a month.
I don't think this is right, but you aren't accounting for quests for the initial runs either.
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Xbox Live User Name - Corrik Currently playing: Division 2