Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
I listened to these and got the BOSE Mobile In-ear set instead. BOSE hate aside I wasn't looking for the best accuracy in my iPhone headset. I just wanted comfort and these In-ears exceed that need.