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60 minutes = 1 hour so 454 minutes = 454/60 = 7.566... hours.
454 + 454 + 454 + 454 + 454 + 454 = 2724
60+60+60+60+60+60+60+60 =480 All the addition can happen in the same step. This is the same as 60*8.
454 = CDLIV
454 is only divisible by the following factors: 1, 2, 227, 454.