I don't think it matters much how many hours it takes someone going solo - it maybe not even the measure of the student - it could be the measure of the instructor (congrats Aldo 8.9 hours to solo ! great stuff) - and I don't think any student will drag their knuckles on the ground reading this either)
I think students getting into this zone would like to know about these aspects ?
............. the other day I went for my first fly in 2 months ! (wind, work, wages) - I thought at the time it was just like going solo all over again