Yes they are. Half dollars are still US legal tender.
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You take 880000*2.5%=22000
Fifty thousand days or roughly 137 years.
it takes nearly 3 - 90% silver half dollars to make an oz of silver IF IF IF the coins are not worn down.. the least worn are the franklin and Kennedy halves the most worn are the walking liberties halves.. it can take up to 6 of them[WL's] if they are really.really worn to make an oz of silver! be careful as Midas Resources,Ted Anderson,and Alex jones claim 2 half dollars equal 1 oz of silver, which is not correct.
One BTU is the energy required to raise one pound of water by one degrees. Therefore, your answer would be one half.
It would take 232 days. *The actual number was 231.48, but since you can't spend in half a day, I rounded to the whole number of days.