Michael's mom loves Bright Scents candles. A 4-inch candle will burn for 8 hours. Michael bought his mom a 10-inch candle for Mother's Day.
If Bright Scents candles all burn at the same rate, how many hours will the 10-inch candle burn?
Since the 4-inch candle burns for 8 hours, the rate of burning is 8 hours per 4 inches.
Therefore, the 10-inch candle will burn for 8 hours per 4 inches * 10 inches = <<8*10=80>>80 hours. Answer: \boxed{80}.