How long do you wait before you invest in the PCs at your table? Do you even wait, or do you try to seed them deep into the world and the narrative from day 1?
If you're a player, how long does it take before you start to really feel the character?
I'm all for helping PCs build their character into the world, but as a GM I tend to not get too invested in any PC until about the 3-5th session. Those early sessions I try to learn who the PC is, but I also try to let the Player learn who their character is. There is some light poking and prodding, sure, but nothing serious. I'm establishing a baseline, not testing the limits.
After a few sessions though I find that the players tend to have a grasp on who their character is, and that means that I can start trying to peel back layers to see how deep things go. Even then, you have to start slow.
What about you? Do you jump right in? Wait a few sessions? Do you ever go after who the player characters are at their core? If not, why not?