Each disk takes about 1 minute to image on a stock A1200, however ages ago when I had an accelerator card installed, it was about 45 seconds.
Naturally bad disks take a lot longer, and you have to judge each one on how long you want to spend on it.
For instance, the end pile of bad was ~150 disks for this lot, and each of those took well over a minute to establish the success rate of perseverance.
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