The average human circadian period length is 24.2 hours, requiring morning light exposure to synchronize it to 24 hours.

“and the idea in mind the just so story " is that that variation allows for entrainment matching to the outside light dark cycle which changes across the year so you don't want it rigidly 24 hours because if there's any variation in light dark which of course there is you know even at the equator across the year there's subtle variations but certainly As you move away from the equator and so these these " variations in you know your circadian rhythm " clock scn supermatic nucleus might be 24.2 mine might be 24.6 24 someone else 24.1 and in that sense " allows some " malleability to to matching the Circadian rhythm to outside light dark rhythms”

“these these uh variations in you know your circadian rhythm uh clock scn supermatic nucleus might be 24.2 mine might be 24.6 24 someone else 24.1 and in that sense um allows some uh malleability to to matching the Circadian rhythm to outside light dark rhythms”