Well, I'm now to the point where I've got about 71M cookies per second, and I'm starting to get bored with it. I've hit diminishing returns on all of my cookie production facilities. I've got at least 50 of everything, at least 100 Shipments and cheaper, and I'm to the point where all of my expenditures are now measured in tens to hundreds of billions. So I'm waiting a minimum of 1,000 seconds to do anything relevant, and nothing relevant is going to significantly increase my cookie production to the point that I'm not going to be spending forever waiting for the next thing I can do. My next cursor costs more than my next time machine because I'm trying to hit 200.
I don't know how you end up with billions of cookies per minute, because I've almost beaten the game and I'm off by several orders of magnitude.
Cookies per second : 70,821,877.2 (multiplier : 242.3%)
Upgrades unlocked
Unlocked : 67/86 (78%)
Achievements
Unlocked : 64/77 (83%)