Study our thread please and you will see comments about succeed mining not only from newbie accounts.

In the PoS algorithm there is no fixed volume of mining produced in one unit of time

No wallet or user can calculate in advance when exactly his/her wallet will be chosen for the mining of new coin. But despite this fact, there is a number of opportunities increasing the amount and chance of new coins being mined, I will list them below:
1. The volume of the stake held on the balance (the more is your share - the greater is the chance of getting mining)
2. The total amount of shares kept in all wallets of all network members (The smaller is the proportion of other network participants - the greater are the chances of getting mining)
3. Complexity at the current stage of mining. With increasing complexity, the volume of mined coins will be reduced. It will happen once in two years. Profitability is reduced by 50%
4. The period of the wallet being online. The more time your wallet is on the network, the greater are the chances of obtaining mining, because only wallets (nodes) supporting the network can participate in the mining (ones that take the information and synchronize with the single distributed registry - the blockchain).

Observing all the above recommendations, you can increase your chances of getting mining, however, it is not possible to calculate mining in advance.