I would say it depends on how many coins you are staking? If they are small amounts then it could take a while before you actually earn a stake. I also have my wallet staking for the past 3 days but still no reward. The network weight must be high at the moment making it a little harder to stake so we just need to wait for it to stake which will eventually happen.
A Masternodes needs 2500 Feirm . I am not enough 1 Masternodes, so I installed POS with 3 input values