The problem with most longevity estimates for light bulbs is that it's very limited and, to my way of thinking, rather unrealistic given the lifestyles and patterns of most people.
I think the common assumptions are 3 hours of use a day or less, which includes single turn on and single turn off.
Most people don't do that. A bulb might not accumulate 3 hours of use a day, but it might also be turned on/off 20 or 30 times in a day.
That said, I've had CLFs last for significant periods of time. IIRC one on my patio was on 24x7x365 for something like 6 years, and the bulb in my front post light, dusk to dawn, lasted for close to 7.
But, I've since switched just about all of my bulbs to LEDs. I like the quality of the light better, especially with Gen 2 and Gen 3 LED bulbs.