Re: How Long Was Bruce Wayne Actually Batman in this Trilogy?
Dialog, character arcs, and the seasonal environments make it clear that the Gotham part of "Batman Begins" lasted a month or so, and that "The Dark Knight" takes place about a year and a half after the start of Wayne's time in Gotham.
It's debatable how long Wayne acted as Batman after the climax of "The Dark Knight." Blake states there have been "no confirmed sightings" of the Batman since Dent died.
However, this just means he stopped interacting with the police entirely at that point, and that he made an effort not to be sighted by them (and not get caught on surveillance, I assume).
I personally find it hard to believe that he stopped entirely, right then and there - he probaby tapered down, continuing to help dismantle the mob until Gordon's work could be completed or set up in a self-sustaining manner, including the establishment of the Dent Act (which obviously wouldn't have happened overnight). Plus, there's got to be a reason why Wayne continued to build and finish the Batcave, which wasn't completed by the climax of "The Dark Knight" but was evidently quite functional later on.
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