Hair growth.. in length..what does that mean?..for potential regrowth?

For the last year and half or more I have been getting my hair cut by a professional. For the first 4-6months or so I was getting get every 5-6 weeks. I started taking supplements a year ago (almost to the day), the basic vitamins minerals and herbs. So around May/June of last year I started getting my hair cut every 4 weeks, all was good until September thru December she kept mentioning how long my hair was (per same cut for the last 1.5yrs+) But at the same time in October I noticed how much hair I have lossed, she never commented on that, as she knew my situation.

However since my Nov and Dec cut I have notice some regrowth, this was with some changes dating back to August, then again in late Nov towards the IH regimen. Now I am up for a cut again this week and my hair looks like it should have been cut last week… How does hair growth in length effect or compare to potential regrowth?

How often do you get your hair cut, and do you have certain indications when you need it cut? Any thoughts on this?