in my time, years ago, when i did my training in UK, I have seen 2 types of pilots, the one from UK , and train in UK. and pilots from USA, trained in the same school.
the guys from USA didn't struggle at all. The guys from UK, really struggle.Most failed their IR.
why? experience....
in resume, if you can not be soloed after 15h-20h, forget about this job!!!
some pilots need 30-40-or even 50h....