Larry Henney writes:

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This reminded me of something I heard at Oshkosh sevral years ago concerning
extended low-speed cruising in Lancairs, although it was with the gear down.  
I recall hearing that a 320/360 could not be flown at 140 KIAS for more than
about 20 minutes with the gear down without overheating.  While I'm certain
that Larry was flying gear up, his posting reminded me of this earlier issue.  
What say you guys?  How long can a 320/360 be flown with the gear down?

- Rob Wolf