I recall a guy who aparently flew with the precision of a Swiss watch from day one went solo in about 7 or 8 hrs. He was certainly an exception though, almost "robotic" as his instructor referred to him. He also went onto Aviation Corps flying Blackhawks.
Remember the GFPT is not mandatory under the syllabus, unless it is specified within the schools training ops manual.
Agree with what others are saying. It's not a race you will go solo, get your GFPT, pass your PPL, CPL, MECIR etc etc when you are ready and hopefully not before.