Takes about 5-10 seconds to show that a user has joined, and 10-20 seconds to show that they've left. Every user running the project resets a cloud variable to a different random value once every 5 seconds. So, to tell how many users are online, the project counts up how many times on average per 5 seconds the number changes. You can use this in your cloud projects and games if you would like by backpacking the sprite.
