I have used the product in my 210 upgrade and it took about 20 to 28 days if I recall correctly. I went fishless so dosed ammonia to 4 ppm per instructions. Then tested for ammonia every two days until it went to 0. Then dosed again to 4 ppm and then tested in 24 hours. I wait until it again reached 0. Then dosed another 4 ppm ammonia and it cleared it in less than 24 hours. I knew the base cycle was done. All in all about 20 - 28 days.
I think left the tank alone to do its thing for another month or so. Then powered on the lights, skimmer, and performed the upgrade. It is good product. Works well. I do not believe it is as fast as they say but fishless worked. There is a thread here when a member did some tests side by side using this product along with the fritz turbo 9000. That product, turbo 9000, cycled in less than a day if I recall correctly. May need to search on it.