title: How does Heroku billing dynos work exactly?
body: <p>I was trying to understand the Heroku pricing system.
   Okay so the free account receives 1000 dyno/hour. What's the exact meaning of a dyno/hour? It depends on what? Requests per seconds? Number of users?
  If i want to switch to the non sleeping offer, i'll have to pay 7$ per dyno. So the 1000 free dynos will cost me 7000$ per month?
  How many users approximately does 1000 dyno/month support?
  Thanks.</p>