Well Sonar gives us about as many options for this as you could ask for... fast export, real-time export, audible or not audible, with live input on or off, or just route your master bus output to another bus (or an aux track or a patch point) and watch it bounce in real time with waveform display.
But if the question is what people generally do... I generally set it to export and then go walk around the room, stretch my legs, get away from the screen. If I watched and listened to it bounce in case I heard something I wanted to change, I would ALWAYS hear something I wanted to change, and then it would never be done. At some point you have to accept that it's time to move on to the next thing... I like comitting to decisions I've made, unless they are really obviously wrong, in which case I will go back in and fix it and re-render. Otherwise it's easy to get stuck in pointless decision loops...