Two turbo vehicles later (one petrol one diesel) I must differ.

The turbo diesel vehicles are designed for long hard use and it is not
uncommon for them to last longer than you would want (My brother's SAAB
9-5 was replaced in mint condition at 260,000km).

If turbochargers were unsuitable for hard continuous use surely the
heavy truck fleet and construction vehicles would use a different
technology.

Where I live we have had some problems with turbocharger related failures.

in the late 1990s we had a spate of Isuzu 2.8L turbo diesels with blown
piston crowns, generally caused by aftermarket kits to increase the
maximum boost pressure - you get what you pay for. Make it possible to
overstress your engine, then drive at overboost for extended periods and
something will break. Factory standard engines regularly get 500,000km
making them very popular with the farmers.

BMW 320Ds with failed turbines - the upgraded engine introduced in 2001
had an engine management map that allowed the turbine inlet temperature
to go too high in our hot and high environment.(30+ centigrade @ 5000"
MSL) Coupled to our long open roads and their drivers habit of driving
for hours at full throttle and the little turbine wheels melted. One
electronic change and a cooling system upgrade and the failures stopped.
All handled under warranty.

Second hand European and Japanese imports with corroded injectors and
fuel pumps - this was a problem before 2002 when low sulphur fuel became
available. The jungle juice we had before had far too much sulphur and
some private imports died. The turbo models died quicker because of
higher temperatires I suspect. Again - ignore the manufacturers
specifications and problems are likely - if the manufacturer does not
offer the model locally there might be a reason.

For what it is worth my Isuzu 2.8l Turbo diesel was the best tow vehicle
I have ever owned. Pity it was stolen.