How many miles or kilometers do the brake pads of the rear drum brakes last approximately? Say on a 4/4.
On a 4/4, unless it's used for racing or extremely hard driving, they will last a very long time indeed. I would conservatively reckon to replace every 10 years / 50k miles / 80k Km, but they would probably last twice that so long as they don't get contaminated and are adjusted properly. I last changed mine in 2011 and they were absolutely fine when I checked them this winter.