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Generally much longer than petrol engines, but there are exceptions. Diesel engines run at much higher compression ratios than sparkers and so need better materials and tougher contstruction to survive. The downside is the materials and construction tend to cost more. There are also differences in daily use. If you make a bunch of short trips they'll tend to lose much of their efficiency. Things are changing now with some of the new designs. This may affect durability as well as efficiency. Hopefully an enthusiast will wander through.
As for the durability exceptions, a number of Diesels (especially those in the early rush to Diesel pickups) were converted sparkers. They just didn't hold up.
Are you looking at anything in particular? Used or new?
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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