How often do you guys earn an interest on your stake? I get it only about every 10th day. Is that normal?
You can stake multiple times a day, or you can stake a couple times a year. Sometimes more, sometimes less. It just depends on several variables like how many coins you have, and how long you leave them sitting in your wallet. These variables (and others, of course) are what make up your "weight". The higher your weight, the more likely you are to mint a block. Just like POW, the higher your hash rate, the more likely you are to mine a block.
Poll
