Yup, 800 and 1600ms are the standard settings.
The problem with normal delay pedals is if you use a standard digi delay, and set the 1st repeat to be the same volume as the clean signal, you'll get more than 2 delays (which I understand is what you want, as that's what Brian does).
People have suggested the ping pong setting (as on a DL4 or DD20) because if memory serves me right, if you put feedback at minimum you still get 2 delays. If you use 2 amps, then 1 goes to the left and 1 to the right. If you only have 1 amp, then just use the mono (L) out and you still get just 2 repeats.
There is not really any need to get a custom pedal made to do this, any pedal which does ping pong delay will do it, just scour the bay.