I usually try to aim for 100% on my first playthrough. Due to this (and the fact that I have so many other games I need to play), playing through a game can take a really long time for me. Also, some games are purposely designed in a way that it's impossible to get everything on the first go (or then you need to use some extremely meticulous strategy in order to achieve that (i.e. Persona 3/4, Final Fantasy X-2, etc.) I'm not one of those people who complete a game in a few weeks by devoting most of their time to that one game. I don't have that much time as a whole, and thanks to the way our TV is set up, I can't play all the time even if I wanted to.