I think three are the minimum for training. I carried up to four spare magazines when I worked. Consider though that my P220 was 45 ACP and that the mags held only 8 rounds. That made my basic load 41 rounds. That was only five less than someone with a Beretta 92 with two spare mags.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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