Clearly this isn't a normal situation considering the way the TARDIS ejected The Doctor after she regenerated.
It "ejected" her because the time rotor was about to blow up and she would've been killed if it hadn't saved her life by tossing her out. Okay, presumably her post-regeneration healing powers (cf. "The Christmas Invasion") saved her from the fall, but they probably wouldn't have saved her from the explosion.
Ah, that's right. Thanks for the reminder. Still, I think this was longest period before introducing The Doctor, but "Rose" might be close.
In terms of running time, I think it's the longest by a good margin, but in terms of the Doctor's actual participation in the story, I think "Spearhead from Space" still has it beat.
Loved the production changes, if the BBC America presentation of it was more than a little annoying. (No beginning or end credits, sooooo many commercials, even by American standards.)
There were no opening credits anyway, apparently.
What I hate about BBC America are those "Stay Tuned for More" bumpers they do where they show a bit of an upcoming scene and trick you into thinking the show's returned when it really hasn't. Those are obnoxious as hell, and sometimes they contain spoilers.