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Night lights that detect light levels are probably flickering so fast that it just appears to be on
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Heat does affect diode lifetime. So brightness/duty cycle certainly does affect how long it'll last, because more energy going through means higher temperatures.
But with any light/fixture that has sane heat dissipation, it's not worth worrying about. LEDs will last decades in most scenarios.