it took 2-5 years to re-build napier
it will probably take centuries
they need money to rebuild and i do not konw
4 and 1/2 hours
about 2 years
3years?
it took about a year and a half
about 13 years
1-2 years
about 13 years
2 seconds
Bout 2 minutes
See: Atomic bombings of Hiroshima and Nagasaki.