[Pikachu_Dad]

The store bulbs claim they last for 2,000 hours. Which is 1.8 years at 3 hours per day.

This site says industrial grade is 5,000 hours;
Super life is 10,000 hours
Turbo life is 20,000 hours (18 years at 3 hours per day)

“PRODUCTS > INCANDESCENT LIGHT BULBS > LONG LIFE REFLECTOR LIGHT BULBS > BR38 REFLECTOR BULBS
Bulborama offers a broad selection of incandescent reflector floodlight and spotlight bulbs engineered for strength, durability, and long burning life. Bulborama offers Long Life reflectors for anyone’s budget - choose from 5,000 hour Industrial Grade, 10,000 hour Supra Life, or our amazing 20,000 hour Turbo Life bulbs!”

[TexasFreeper2009]

I have very high ceilings and a lot of bulbs (over 200) in my home, for me it's more about the hassle of changing them constantly when they burn out that is an issue, but being able to save money on top of that is icing on the cake.