It depends on what game and how many games I'm going to play.
Generally I break with a different cue......for each and every game.
I like to let the crushing effects of my break subside in my break cue before I use it again. I've measured my break cue to be as much as 2 inches shorter after I've unleash my fury on the rack. One time, I accidentally broke with one twice and I literally ended up punching the rack with my clenched fist and shattering all the balls.
Can you say embarrassing ?
So I typically bring 30 or 40 break cues with me and an extra set of balls just in case.