On a single stage batches of about 200 are the best. Clean/polish on evening #1, Size/deprime/flare on evening #2, Prime evening #3, Finish evening #4. Working slowly none of those should take more than 2 hours at a time.
If you plan ahead so you don't need to load up 500 rounds the night before your CCW class, it doesn't take long to build up a good supply and it gives you a good project.
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