450k hands at 10NL? wow. and i thought i had the resident title...lol. i dont know if even i can last that long down here.
however, i think we all know the number for "true win rate" is HUGE. but, i think we can get an "idea" after 25k....meaning, if you are killing it (8+), you are likely a long term winner there. of course, nothing is absolute, but i think you can confidently tell your friends you win playing poker.