Dear EHBH;
The PPL flying phase is 45 hours. if a cadet takes 50 or 60 then he/she is charged for the difference. I am not sure what you mean by "you are responsible". Our responsibility to to make sure he/she is ready for the PPL check ride, and the Flight Instructor and the CFI decide when a cadet is ready for the check ride, not me. So if a cadet takes longer than the syllabus, then we do charge them for the difference, just like all other FTO's. This is customary and standard practice across the industry.
Obviously, it owuld not be appropriate for me to discuss with you specific financial charges between a particular cadet and the academy without his/her permission. However, if anyone has an issue, please have them contact me or accounting and they will be given a complete and detailed summary of their account. This is their legal right and our obligation.
I hope this helps.
Marwan