There always seems to be a bit of a scramble to go solo quickly (which, I suspect, stems from the RAF training programme which used to wash-out students who didn't solo after a set no. of hours); ultimately, this doesn't seem to have much bearing on the quality of the 'finished' pilot, as those that solo quickly are sometimes slow to grasp RT or Nav.
There was one chap at our flying club who literally took hundreds of hours to get his PPL and I think he fell into the camp of those who really shouldn't be flying at all - like little old ladies on their 12th attempt at a driving test - otherwise most people tend to solo at somewhere between 10 and 30 hrs.
However, if you're learning to fly, I wouldn't obsess about this issue - just enjoy the experience of learning. It'll happen when you are ready and not before!!