One buys hot coffee and keeps in a thermos the entire day. When he buys it, he takes a few sips (enough to qualify to make a bracha) and has in mind that he will be sipping from the thermos throughout the day.
Since he has in mind that he will be doing this throughout the day, does he need to make an additional blessing later on, or does the 1st blessing cover all the other sips? How much time would have to elapse between sips that would require him to make another bracha?
