Corrected entry: Sorry to spoil all the fun of the nail-biting finish - but let us remember that the "bomb" was actually a decaying neutron reactor. There is no forecasting, months from the moment, exactly when it will decay enough to explode - that will rely on catalysts such as heat (Gotham's climate) and oscillation (how much it is shaken about when moved around). Also Neutron bombs are big on radiation and low on blast compared to traditional nukes so getting the bomb 6 miles off the beach before it blew (whichever way the wind was blowing) would leave much of the East Coast of America a no-go for decades.
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Correction: The bomb is a decaying fusion reactor, described in the film as being an experimental prototype of a clean energy system. This is not technology that exists in the real world, about which we only have very generalised statements are made. As such, no "factual" claims can be made regarding how it might behave in its weaponised form.
Tailkinker ★