Just to clarify, I am talking of boarding as in PAX from Jetbridge into Plane, I don't care what happens between boarding desk and Jet Bridge

and if -I repeat IF- boarding crews for once get "boarding by row" running, it works easily in 5-7 minutes. Last 753 I had it took 15 minutes for 260PAX via one jet-bridge through door number 2L.
And I repeat my above said, with good pax (not the average fat turkish granny with 5x 10Kg "hand baggage" bags going to Anatolia (please don't tell me this is not a good example... half of the flights I work at are that way

) or drunk Palma de Mallorca fliers) it works. If you would have quoted the 2nd part of the sentence, you'd have noticed I made exceptions for these

. 15 minute TAT is what I regularly see on FlyBe E95 with 70 PAX down, 70 PAX up and 7 minutes fuelling (--> 8 mn for deboarding and boarding).
Most days the 189 PAX 738 take 15-20 minutes for boarding due to the above mentioned type of PAX, or one of the regular boarding computer break downs. But it IS possible. AFL A320 with 140 PAX (incl. 7C class), usually takes no longer than 5 minutes for boarding through jetbridge, as PAX are mostly routined fliers on business trips... Same game on AerLingus, just no C-class.
@JS
It's usually not the airlines to decide about that.. some indeed
demand boarding by row, but all the random airlines (PGS, ORB, etc.) don't care.
I instead demand it from boarding crews therefor, because that way I can get the plane out more likely being on time. Apparently I don't get a bonus for bringing out planes on time (less than
5 minutes after scheduled dep. (unlike AWS' generous 15") ), but since I love the job, I give my very best, to make everything run smooth

.
Most of my colleagues don't care though. Understandable, given the wager :/
Apparently my personal on-time rating is just 50%, mostly due to slots though. As I learned, slots in real world (at least at DUS) are different to AWS... airlines don't have slots at all, they are only
assigned during peak traffic hours, or times of single runway operations (happening often during rain or hot periods, as the secondary runway is only 2700m incl. overrun areas, 2200 in "official" length) to somehow guide the air-traffic, and keep them at their positions as long as possible, to save fuel.
But yet the main holiday season has not begun, so air traffic is by far not at maximum... 'only' 7 daily flights to ESB, IST/SAW, AYT, PMI and LPA each (totaling about 1000/day seat supply each, with mostly full a/c... AWS demand: <250

). During main holiday season (starting in 2-3 weeks) this will roughly double... congesting DUS nearly as much as LHR, just all in 738, not 744/777

cheers,
Jona L.