Every day around midnight if you had earned minimum 0,01 mBTC, your earnings will be paid to your wallet.
You can check it in your Shorte.st account to do it, go to your Statistics and select on the chart “Mining” stats.
Payments are made on every 10th of the month to your account on Paypal/ Webmoney/ Payoneer.
Remember that estimated value of your monthly earnings based on the processing power of your PC and current BTC exchange rate. This value may fluctuate in the course of a day, this is perfectly normal. When your computer is busy - the value slightly goes down, when you do not use your PC - it goes up.