hmmm.... a very awkward way of leveling up an account :S. You do however say you will laugh once you will get a higher ranged than the people posted on this topic (including people with 99 range), and as Finch stated, 99 range would take you about 90 years. I wonder why you would ever consider spending that much time further on this, why there is already someone doing it, and whatever you're doing now is not leading to something very contructive.
I can tell you I got all my levels in f2p, and that is hard enough with 30k xp/hour max rate of xp on most skills, you got 40k xp in 3 months :S
However i must congratulate you on your persistence i have to give you that, since not many people would ever consider getting 40k xp in this way let alone trying to get 60/70. Good luck on your goal, but really a hint: do yourself a pleasure and get back on your main, you had your fun on this account, now get back to your main
I rate the achievement 6/10, only because you have the persistence to get a level this way. Put it in your pocket and return to your main now!