I had a pretty horrible time getting my 1st one. Took a good 5 hours over a couple days and you could probably get a decent idea of how many rounds that was considering it's the dumbest, easiest farm in the game.
That said, I'm pretty sure I have gotten more Bees than any other legendary in the game and most of it came while passively farming sort to say. After I did a pre-patch Geary Run. I would kill King Mong, than drive to the Boneyard and go after HH and got more Bees than I could count. Most of them sucked lol. I Pulled an Alkaline Bee out of the treasure room that none of my other findings came close to.
I got a level 49 Bee after about 20 kills. Then a level 48 Bee after about 10 more. Finally got a level 50 Bee (lower capacity than the lvl 49, but greater everything else) after about 20 more. Kept the lvl 50, sold the others.
I didn't do the aforementioned things in one sitting though. I interspersed the HH farming with some Warrior farming in between and spread out the activity over a 3 week period. I still haven't gotten a CC, but I got 2 Flakkers, which I sold. --- I like what I do, I do what I like I can quit and get it back like I'm ridin' a bike