Originally Posted by dcadude
From the time I stepped on one after landing on an international arrival until it arrived at immigration hall, it took 48 minutes on Tuesday afternoon.
The mobile lounges are the second worst thing at IAD (after UA's Terminal G).
Why did it take 48 minutes? Chances are you should not blame the lounge. The lounge transits from gate to immigration in 5-10 minutes, or so.
The most likely reason for the delay on the international arrival (particularly after 4pm) is that the waiting area in immigration was overflowing. I have been on the ML, and the driver would not open the gate. The wait for the ML, and the transit time of the lounge have nothing to do with the lounges themselves. The problem is the limited service at customs and immigration. I do not know how the ML arrival is scheduled.
Although I have never timed my plane to exit time at LHR, the walk, and the immigration line for example, also seem to be very time consuming.