Its not the flight time so much as the launches needed to complete the syllabus. As long as the syllabus had been taught and you'd shown enough aptitude to pass the solo check then all is well!
I'm still amazed how quickly students learn, particularly if there is continuity in their training. I did my Proficiency over four weekends and from memory went solo in just over 1 hour airborne, but continuous course students were frequently going solo after less than 40 minutes and in 1-2 days!