Comment by V99

If you don't go often enough you definitely won't make the same progress per session. You'll spend most of each session trying to remaster what you lost from the last one.

For powered flying, one a week is already on the low end... most instructors would recommend 2-3x/week.

Flying skills are very perishable, especially when first learning. This is why there are several different rules about recency of experience before you can do things like carry passengers, recurrent training requirements, etc.