I always tell people what does it matter? Nobody cares how much pre-solo dual you had in the long run.
I don't even know the number in my case. OK, I just dug my first log book out... looks like 12.6 hours before the lesson I solo'd and probably a little in that because the lesson is like 1.6 and the solo time is only .7.

All I can remember is dumping the instructor out on the taxiway with instructions for three full stops. That and the tower calling me as I was turning crosswind and asking "Doesn't it fly a lot better without that fat guy in the right seat?"