How many hours of UVB exposure is recommended?

It also depends on how strong the UV is.
But for most set-ups with 5.0 Repti Sun or 6.0 Arcadia T-8's, 10 or 12 hours a day is the norm.
 
Some choose sun up to sun down. Natural progression of the day, but if your cham is inside a warehouse like mine, it doesn't really matter! :p I have lights on from 7a-7p...
 
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