I am waiting the sixth day on first stake and nothing happens
I have just 760 unify so maybe I must still be patient...
It all depends on how many inputs you have on your amount. If it is all divided into little chunks then you will receive more unify after a period of time. In the beginning I had to wait a week for 1 stake, now i receive around 15-20 stakes each day.
Yes that is true however you must also have a lot more Unify to earn 15-20 stakes per day. I have 10k and not even I get that many stakes per day and yes all my coins are split into smaller blocks but still only average around 2 to 5 stakes daily. So I'm thinking you have at least 50k or more to get that many stakes per day.