Minimum coin age is 1 day or 24 hours. The more coins you have in your HYPER wallet, and the longer it's been since you moved the coins, opened (or unlocked) your wallet, the more chance you will have of automatically generating proof of stake blocks.
Ideally PoS blocks should be generated every 24 hours and compounding, based on a monthly PoS interest of 5%. This may vary slightly for a number of reasons such as the number of coins in the wallet.
Hope that helps
here is your answer.