Nargott
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As I mentioned before, 100 uses is just a formality; in most cases, that many aren't needed. 10-15 would be more than enough. But again, everyone has their own opinion; some might say that even 2 is too many, while others might say that 50 is too few. Perhaps it would be worth conducting a mini-poll...
Honestly, I doubt anyone would say that 50 is too few.