How many hours student pilot generally have when going first solo?
Well Roger, you have your answer. It is very variable, depends on many factors, natural ability only being one of them. Natural ability when coupled with other factors, such as experience and quality of instructor, how busy the aerodrome where training carried out, amount of time and money available to devote to training all contribute to the amount of time to that first solo. And there are no doubt other factors that can be influential in the time taken as well.