Im currently doing my ppl (12 hours) and i basically work on 1/2. So for every 10 lessons/flights booked, i would expect to fly 5 of them but wouldnt be suprised to fly none of them.
My first week i booked one every day...flew every day.
Last week, i had one booked every day, didnt fly at all.
Went up today at midday and it was lovely minus the odd rain drop. Just doing circuit consolidation and it was a pleasure to fly.