I've just read this interesting little piece about Doha airport.
Doha Airport- size and walking distances
In short. it is all in one building and there are 5 concourses named A, B, C, D, and E. The average walking distances between concourses is 9 minutes and the minimum transfer time is 45 minutes.
So, to walk from the very far end of A to the beginning of C would take an estimated 18 minutes. She states in the deleted scenes yawnfest that if she had started in C she could have walked it which is what I think she did last time, and was really pleased with herself. A slow person walks half a mile in 9 minutes, at 3-4 mph.
Also, unrelated but so as not to shit up the thread, I'm here for Thailand beeze. I want to see her put her foot through a sodden tuk tuk floor before capsizing it in Bangkok, ideally on Khaosan Rd. Not sure how many Syrians get Thai visas but extra points if she winds up in Bangkok in August, wearing that tent, alone.
Edit: completely honours English