so I have a POS mining question

I bought mintcoin awhile ago and then I loaded my wallet and unlocked it and such and for some reason when I opened it a few weeks ago my income never went up.

So if I want to POS mine my coins, do I need to keep the wallet open at all times? ie- if I want to POS pandacoin I need to leave my computer on, with the wallet open for the next 2 years sorta dealeo?

Thanks.