When do the better players decide to leave a table?

[BEEK]

Provided that there are other tables at the dollar level you are playing at and other casinos in the area to go to, when does one leave a given table?

Obviously, this is when the cards have gone stale or have been since first sitting. So, how long is too long to wait for good cards?

Mind you, I am aware of stealing the blinds and bluffing the weak guy for the pot in the lulls between more playable dealings. Does one wait for 2-3 rings around the table before changing or what?

What is a good threshold or line to set and why. So as, to not wait too long when better money is had elsewhere?

Thx
L