Diesel Engine Minimum Run Time

Me included.
I prefer to leave the engine rather than running it under no load every week or two.

I turn it over decompressed now and then to move the oil around a bit.
Or I take it for a brisk spin around the harbour, hoping to inconvenience some of the biology on the hull.
 
My first reaction to a boat failing to tack would be "What am I doing wrong?", followed by "How can I fix it?" - NOT "Oh, dear, I'll have to run the engine!", and even if I did have to run the engine I'd regard it as a bodge to get me out of a situation, and work out how to prevent it from happening again. The only case where I can imagine needing the engine to tack would be in VERY light winds - and I'd probably be under engine anyway! Of course, there are boats that are difficult to tack - but not many.

I do wonder if some people don't know the trick of holding the jib aback for a few moments to ensure the head comes round? The first "big boat" my Dad had was a gaff cutter rigged converted lifeboat. That had a long, straight keel extending from bow to stern, long straight bilge keels and a vast amount of iron ballast. She was never designed as a sailing boat, so it was a miracle she would tack at all. But holding the headsails aback would get her round, and although I can remember us missing stays (my memory is unreliable - I was about 8 or 9!), it wasn't a usual thing. We were sailing out of South ferriby on the Humber, so missing stays was likely to put us aground...
 
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