IIRC, we touched on this before... The only light(s) I run 12/12 are the plant lights, because that's often the cutoff for short/long night plants.
https://extension.oregonstate.edu/news/what-are-short-day-long-day-plants
As far as UVB, early morning and late afternoon, most UVB is filtered out by the atmosphere.
... so I have my UVB set to come on an hour later—and turn off an hour earlier—than the plant lights. This has the added effect of extending the usable life of the UVB bulb by up to 2 months.
Basking lights—as have been mentioned—can also be shortened, depending on species and ambient temps. (No sense in having a basking/heat lamp on any time the ambient temp in the enclosure is at or above basking temp.) I have my basking lamp set to go on & off with the UVB, but during warm weather, I shut it down earlier (I just have to remember to turn it back on for the next morning!

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