9 days is minimum staking age, this means your coins wont stake unless they sit in your wallet for 9 days. After that it depends on how many coins do you have and what is the network difficulty. Do not worry, your stake will may not happen exactly on the 9th day, it can be a day or two after but the wallet takes into account the age of your coins so you will not lose anything if your wallet stakes a bit later since your reward will reflect the age of your coins and you ll get more. Hope this helps!