Let M be the number of hours Bryan spends on marketing posts.
He spends 4 / 2 = <<4/2=2>>2 hours on advertisement posts a day.
He works M + 4 + 2 = 8 hours a day.
Thus, Bryan spends M = 8 - 4 - 2 = <<8-4-2=2>>2 hours on marketing posts each day.
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