A simple math calculation of there being 4 6-hour periods in 24h tells me that the answer is either 4 or 8 per day. Check with your doctor if unsure.
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1 day = 24 hours so every 4 hours means 24/4 = 6 per day. 90 @ 6 per day equals 90/6 = 15 days.
24 hours !
i think you may have that backwards. i think you mean how many hours in a day. because there is no such thing as days in an hour. there are 24 hours in a day if that helps.(: You could also say that there is 1/24of a day in every hour
Alot. I am a runner and I train about 3 hours every day, even on week ends, you have to be commited to it.