There is NO proof that this lightbulb can go for 20 years.
last for 20 years if you leave it in the box
LOL. I never thought of it that way.
I have always been disappointed with the actual longevity of supposed long-life light bulbs. I think the best you can hope for is that they last 20% longer than a regular bulb, if that.
One of my handful of 5 year CFLs lasted less than 6 months. The thing turned magenta on me. Bring back incandescent bulbs. They use more energy but have no mercury making them better for the environment.