In general how long it should take to receive a payment and what have people been experiencing.
To speed up transaction processing, you can offer some fee in the client settings. Then the transaction will be included ASAP.
Does the fee go into a pot and then split among the "coin generators"?
Does the fee help speed transactions being received only or sent as-well?
Is there a finite # of free slots, or will they increase if more users join, or is it a supply and demand thing?