hobbzz:
The cycling is not quite linear in it's progression, but it should be noticeably less and less time each cycle. If not, up your dosing or add more bacteria. I have seen the time cut in half each cycle, and others, not so much. You may need to pay a little closer attention to your parameters. How big is your chamber again? Youre dosing 6mLs? Your flow is good?
FYI, I found myself dosing about 25-30mLs of 50% in a 5 gallon chamber when I was under a week...
Are you seeing Growth of Bacteria? Are you taking photos of the chamber each cycle? (The bacteria should at least double each cycle and get more and more visible)