You're right, it doesn't have to be 10 consecutive minutes, although I assume that's how the procedure is understood by most folks who hear it on the TV or radio.

From what you're saying, Sue, it sounds like the 10 consecutive minutes/hour way doesn't work all that well and that more frequent episodes running the engine would be better. However, I wonder if the battery issue would be even more an issue if I'm doing multiple engine start/hour for 10+ hours. However, maybe idling at higher RPM's to increase output from the alternator (and get more heat, to boot) may compensate. I just don't know, which is why I'm wondering what people's actual experiences are who have tried it.