Far far far too many. It depends where you are I guess. Come & live in the UK & thank the good Lord for the BBC & don't have any adverts (Excepting them plugging their own shows, which is bad enough) & then guess which correspondant is quite happy to pay his TV licence ! Oh yes, the answer is probably about 6 or 7 minutes per 1/2 an hour even on UK commercial TV.
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it's typically 15mins per hour so 22.5 mins
1 and a half. There are one and a half minutes in one and a half minutes.
theres 30 minutes in a half hour.. theres 90 minutes in an hour and a half.
Ninety minutes are in an hour and a half
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour