Optimal Frequency of Lessons

Just coming off my latest aero flight just over a week ago with Mr.
Stowell, I've decided that I want to take advantage of the momentum
and start a more formal course fairly soon. I think I have an
instructor nailed down. My plan is to start with a 5-10 hours course,
spread out over several months. But here are the issues.

The airport is about 70 miles away from where I live, but only about
19 miles from my girlfriend. This makes it convenient to some extent,
but her house is on the market and I want to take advantage of her
location before she sells.

I know there is a benefit to flying as much as possible to increase
tolerance, but I would like to spread it out over a few months as I
tend to retain things longer if I acquire them more slowly. But I
would also like to get as much time before the hard NJ winter arrives,
as the airport has a grass strip.

I'm thinking twice a month, with the possibility of both Saturday and
Sunday, weather and schedule permitting for the first few sessions.
Would like to hear some ideas. I would also continue to fly casually,
particularly with the goal of remaining IFR current.

Dave