It is also affected by amount of use the car gets and type of braking.
I recently read a post (somewhere) from a US owner with over 200,000 miles on original discs and pads.
A Gen 3 Prius I had from 2012 to 2016 had less than a quarter wear at 60k when I sold it, and my last Gen 4 sold at 40k showed the same very low wear. I try to plan ahead to get the best regen energy recovery, as well as smooth and comfortable progress. Since Gen 3 Prius, Toyota Hybrids have had a Hybrid System Indicator which I use to good effect (plus in the Gen 3/4 Prius the HSI is visible in the Head Up Display) to help get max regen and min brake wear.
I know another owner whose brakes were fine at 100,000 on a Gen 2 Prius when he sold it (although his was garaged, unlike mine).
My last Gen 1 Prius (2002-2011) had minimal wear showing as the car reached 70k, but then for a year I used a company Prius and mine only got driven once every week or two, and then usually for short journeys. The rust was the killer, and the brakes were very noisy with grinding sounds and all the discs/pads needed replacing within the next 10k miles. The car was then used daily until I sold it at 9 years old with 163k and the discs/pads were still well under half used. This car was not garaged either.
From 2007-2011 I was manager of a fleet of Prius London minicabs (about 40 cars when I started and nearly 300 when I left), and some (but by no means all) drivers managed to wear out their brakes from using them enough in slow traffic (earlier generations only used the disc brakes below 7 mph, later versions from 5 mph) and hard enough above that to use the disc brakes as well as the regen.