I recommend to keep them on at a maximum of 10 hours per day.
But you will find other members that will keep their lights on even longer without any problems.
I myself keep my light on from 11am-7pm so 8 Hours.
Some people (myself included) like to start their lights up around 2 pm so they'll be on until 10 pm more or less... that way you actually get to see and enjoy your tank when you get home from work.
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