Unity doesn't care what units you use are. A game all about ants might have 1 unit = 1mm, and dinosaur game might have 1 unit = 10m. A space adventure game might have 1 unit = 1 parsec. It's down to you. What is important is that you decide what works across your whole team. 64 sounds like a strange number. Unless you have a good reason not to, just use regular units, so, a player might be 1.5-2.0 units tall, so one unit is one metre.
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