Hello, welcome to the forum.
I've Just dropped my block off for a rebuild: - 97k. It's only being rebuilt because the car has been outside and not run for about 6 years, so I want to get rid of the old oil sludge and rusty bits such as the water pump sealing face. There really isn't anything wrong with the internals, bores, pistons, bearings, oil pump etc. all good. I've not cleaned the head yet but on first inspection there's nowt wrong with it.
That's all the experience I have, so all I can say is one with 100k that's been well serviced should go on for a fair bit longer.