I just did my first roosters in two batches of six each, a mixed bag of barred rocks, partridge rocks, RIRs, and one black one--not sure if it was an australorp or a Jersey giant. Anyway, by myself (and it's been cold, so keeping the water hot enough to scald has been a problem) I average just under an hour apiece: Kill, scald, pluck, gut, wash, bag. I'm used to duck hunting, where it's usually just skin and breast them out; this takes me much longer. However, the first few take the longest as the water isn't usually quite hot enough when I start, so plucking takes forever. The rest go quicker. The biggest time saver for me is a bigger scalder, which I will be rigging before my next processing (probably this summer).
Also, on the resting thing, we fried one up the first night and the dark meat was rubbery (to the point of being inedible--I have since cooked it down for soup meat). After being in the freezer two weeks, I put two more (that had been halved) on the gas grill and they were fine. Legs might have been a bit tough but nothing serious. The second batch of six are currently "resting" in the beer fridge since being processed yesterday. I won't make that mistake again. But in my limited experience, freezing does help.