I can't believe the 55 hour run time is for the full 720 lumens. The copy should include the full specs including the available different operating modes so that we can make a more informed buying decision. I know Drop just hired new copywriters; they might work more on briefing them better.
MikeegeNitecore states the following runtimes at https://flashlight.nitecore.com/product/tip2 : 720lm for 15min, 200lm for 1h15min, 30lm for 8h, or 1lm for 55h. My experience with Nitecore products in general leads me to think that these claims are accurate.