Well, I did the break in this weekend.
It took me, I kid you not, 4 hours to fire and clean the first 20 rounds.
I'm sure I could have done it faster if I was allowed to clean the gun when the line was cold, but no one is allowed to touch their guns when the line is cold.
I cleaned the barrel after every shot for the first 20 and then after every 10. I shot 75 total rounds on Sat. and then another 40, still cleaning after every 10, on Sun.