How long should I go on engines?

[Eustacio-Chachi]

I just had a problem with an engine with 34.6 hours since OH (done in Florida, will not name the shop to protect my rights). The reason I had both engines overhauled even though there was no indication of problems, was because in 19 years I had only put about 1300 hours on them.
I could not make the planned trip to Canaima in Venezuela and hope to make it to Key West, the engine should be back next week.