I just checked timing for my calls. Average length is 8 seconds. Example: Traffic Kyneton. Foxbat 0000 joining downwind runway 36 Kyneton. Other calls are no longer. So, with (say) 5 aircraft, each calling inbound, downwind, base and final, you have 32 seconds per aircraft, 160 seconds for five aircraft, call it three minutes, of radio calls in the time it takes to get from 10 miles inbound to on the ground, typically ten minutes. About 30% of the time. Seems OK to me.