The longroll magazines held enough film for around 180 frames. Usually 2-3 were sunstruck at each end of the roll because the darkslide was not employed in the traditional manner.
The astronauts generally didn't bracket for exposure, although I agree it's common practice in other photography -- especially on reversal film. The E-3 emulsion was chosen supposedly because it offered more options in the darkroom to recover poorly-exposed frames. But the astronauts generally just shot one picture of each intended subject and didn't worry too much about optimal settings. There are some interesting interviews you can read in the historical record about the photo training.
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