I think the number of landings is more important than total hours in the logbook. I soloed at 19 hours I had just over 80 landings, which is a function of how busy your airfield is, how fast your aircraft and how long your circuit. After 1st solo, everything happened really quickly to a point with circuit bashing, then slowed and went backwards after a 6 week gap and I had to relearn how to land before starting solo cross countries. Nevertheless I completed the general skills test at 46.3 hours and somehow regretted it a little because learning had been so much fun! Now however I am learning with every flight, just without a formal syllabus, and still having fun.
Looking back on it, time to solo is about as relevant as your grades at A level or your degree classification. Means nothing after a day has passed. (Except you'll remember it forever. It is definitely up there with getting married, birth of your children etc)