I would say 9 times in 12 months is more of a regular than 3 times in 2 months. Duration is just important as frequency, if not more so.

I see my ATF at least once a week for the last 9 months; that, I would think is regular.

It would depending on chemistry, good great potential for a ATF, and if not well .....time will tell

Generally I consider a regular someone who comes to see me at least once a month over a period of time... there is no set time frame, though I wouldn't mark you as a regular over a short two month span.  Regulars continue to come back regularly, it takes time to see the patterns.

I have two fellows I consider "regulars" even though I only get to see them once a year.  I look forward to the annual events which bring them to Seattle!  I know other ladies who only consider regulars those gents who visit weekly or twice per month.  As to whether your lady considers you a regular, you'd have to ask her.