With difficulty 0.027 you need ~ 11.58 * 10^7 coin-day-second to find a proof of stake block.

If you have 1 coin with age 30 days, then you have 30 coin-days. I.e. estimated block search time will be ~ 11.58 * 10^7 / 30 = 3.86 * 10 ^ 6 seconds = 1072 hours.

But we don't take into consideration that the age of coins isn't constant and grows while block searching process.