So you torture him and he tells you where, and then the bomb goes off somewhere else...

So you adjust the story a bit more, to avoid that kind of problem. E.G. an hour is cutting it a bit fine, let's make it a day.

But the real world just isn't as cut and dried as that, where the torture subjects cooperate in setting the parameters just right.

That kind of scenario just isn't what torture is about, in the government run torture centres dotted around various places. It's about people who have fallen into the hands of the torturers, and are being processed, and they may or may have some kind of information which might be helpful in some way, if it can only be sorted out from the mass of irrelevant or misleading or totally fabricated stuff that people will come up with to stop the torture. (And the people who know least, or know nothing, are going to be the ones who come up with the most "information" - the ones with the infirmation are going to be the ones who hold out longest, and likely die under interogation.)