Can't help you on the removal/install times as I used a unit I bought from another owner here, and one from a salvage yard VX, but I'm sure one of the others will answer.
The two units I've sent in had a turnaround of about 16 days MAX. One unit I sent they had to do more testing until they ID'd the problem, took a few extra days.
They pay for shipping one way, and you can have them use a faster delivery for the return, you just have to pay for it.
Another way you can do it is to find a salvage yard ABS unit, and send that in (with YOUR VIN and ID). I'm not sure how much just the ABS module should be from a salvage yard as I bought it in a bundle of parts, so no individual price.