Might be worth noting that if your aerodrome charges for landings, then the quicker you pick up landing the plane, the less money it's going to cost you in the long run.
I went solo after 6.5 hours.
I did 6 landings with my instructor and he sent me solo, I was a natural to start off with which greatly benefited me, sometimes you got it, sometimes you gotta practice.
(Thats enough of blowing my own trumpet! 
) To stress on something when you do start your circuits... (Don't be afraid of back pressure!!!") I'm sure your instructor will teach you properly, but remember that 1 point, it will stand you in good stead.