My yacht has a longish fin keel
and I was surprised when following the loss of my autopilots to lightening it would happily maintain its course for close to hour. (52 mins was the best)
Conditions at the time were good at the time on a shy reach with 20k breeze in offshore
The autopilots are now replaced and I havenít tried since, but to those owners of fin keeled yachts give it a try you may be surprised.
I can see how a long keel
yacht could sail for hours, but I still feel self steering
(and a backup if possible) is essential for an yacht offshore
with a short handed crew.