I honestly don’t remember, but I think it was longer than “normal”. That’s in quotes because I discourage people from getting hung up on time to solo and time to checkride. While I want students to move along and achieve their ratings in a timely manner, and there’s the matter of expense, I’m not a fan of doing it with the minimum hours. This seems to obsess some students. I’d rather see them go when they’re ready, with MORE experience rather than less.
For me, it was situational awareness with regard to directionality. I had a poor sense of direction before learning to fly. The first time I lost sight of my home airport and got confused on a solo flight really scared me into improving this. Now I think very well in this manner and make an effort to teach my students how to do it.
Speaking very generally, I see two typical kinds of students - people who excel in controlling and maneuvering the aircraft, and those who grasp concepts like aerodynamics and airspace more easily. Each can become excellent pilots, but sometimes need to work harder on the area they find comes less naturally.