Well I'd say it's feasible IF you never drive in the rain and the car is always stored in a well lit humidity controlled showroom.

i used to own an E type and I only washed it every 6 - 8 months or so. According to my wife it was more like some sort of witch doctor's ritual consisting some man with a stick dancing circles around bonfire (me walking circles around the car holding a dryer with towels strapped to my belt)