Staking is just like mining. Just because you are eligible to stake doesn't mean you will immediately. This is not unique to BALLS, it is how every coin works
i stake a few other coins, im not saying it had to stake 24 hours on the dot, but 3-4 days as appose to 1? im guessing my assumption is right in that it has to do with the difficulty
If you only stake once every few days, you will stake for a much larger amount than if you staked everyday. Stake weight is based on amount of coins and coinage
The staking yield is calculated on a per year average. Trying to monitor it day to day will be frustrating and inaccurate