Weeeeell, I usually hit 161 000k around 1/3 into BG 1, usually after mass genocide of Sword Coast's basilisks solo and cleaning "tower" part of Durlag's Tower.It doesn't really make much difference and that goes double if you didn't reach the XP cap in BG1, which most people don't.
It could be true for erm... normal people, but I could bet that general level of autism among Codexers is high enough for most people here to have similar experience.