First of all, good for you : )
Second of all, spare a thought for those at the opposite extreme where it takes them a year to see *less* than half an inch permanent change.
Very worthwhile question, glad you asked.
I, and others calculate that at 10.5" you are pushing the physiological limits of your heart, (your heart-rate has to increase to maintain blood at higher pressure in your erection) and human female anatomy. Why human female anatomy at 10.5"? Because to have a solid base to push that length of dick you want to have a base girth of 7 to 7.5" that's getting to over 1" what most women will tolerate comfortably. Not that you're going to get your base into the pussy from most positions if you are 10.5" from the tip.
Don't believe the BS about ��������� being 12-14". Search for the pornstar's true sizes thread and you see that they are mostly 7-8" with some freaks perhaps hitting the 11.5" but that is, in human terms, monstrous.
Even someone like __________, who looks like he has an alien-sized cock when you see it for the first time, on calmer evaluation is less than 10".
Be aware that __________, the guy with the validated 13-14" penis struggles to get hard, never mind stay hard.