It's 'a 90 days' supply'.
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1 hour = 60 minutes 1 day = 24 hours = (24 x 60) = 1,440 minutes 90 days = (90 x 1,440) = 129,600 minutes. Why do you ask ?
90 days is 12 weeks and 6 days.
There are 129,600 minutes in 90 days.
1 day = 24 hours so every 4 hours means 24/4 = 6 per day. 90 @ 6 per day equals 90/6 = 15 days.
90 m