There are a number of 'Carnegie Hall's' and modifications. The links below will give you extensive information.
4 years
It would take 20 hours because you have half the men, therefore it would take double the time.
It took 10 years to build in 1997,however is only a replica called Shakespeare's globe theater
it took almost six months to rebuild the second globe theatre
75 / 5 = 15 days for 12 men to build one house. 15x12 = 180 days for 1 man to build 1 house. 180 x 7 = 1260 days for 1 man to build 7 houses. 1260 / 20 = 61 days for 20 men to build 7 houses.
25 years
20 years
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hs2 will take 15 years to build
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a long time
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