I'm in the once a year mindset. When I started driving you changed the oil every 3 months or 3000 miles which ever came first, you changed the sparkplugs, points etc every 12,000 miles. Over the years the duration and mileage has evolved to where a lot of cars are going 15,000 miles on the same oil, 100,000 miles on the plugs... Most oil will hold up for a year with 5000 or more miles, even dino oil.
If you fire it up and drive 2 miles to the burger bar and later 2 miles home and that is the extent of your driving in a given day, change it several times a year. If you drive it for at least a half hour at a time that should be long enough to get all the condensation out of the crankcase, change it once a year. YMMV