Is there a minimum size of network for a cryptocurrency to be viable?

Is there a minimum size of network for a cryptocurrency to be viable?

I am not a technical person, so easy answers will be greatly appreciated.

  1. What is the relevant unit for size of the network for this question? Nodes? Miners? Wallets? Users?
  2. If a cryptocurrency has a very small network, e.g. 10 users, will it have 'technical' (not marketing) problems to function as a currency? (Like protection against hacking, efficiency of transaction speed and cost, etc.)
  3. If yes in #2, what size of network would be required? 1000? 10,000? 100,000?
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