Have received the 16MPL give away - many thanks.

Just a quick couple of questions about the Proof of Stake, by receiving the 16MPL does that mean I've proved I have them in my wallet? and does that then mean the clock starts for the 2% 'interest' - when is that paid eg daily after the 30days have elapsed or yearly?  Do I need to keep my wallet open non-stop to ensure the stake is verified?

I read most of this ---> https://en.bitcoin.it/wiki/Proof_of_Stake which seemed to talk about coins 'evaporating' for want of a better description if the wallet isn't kept open, am I miss understanding this?

(My apologies if these questions are a little dense, I'm still fairly new to all of this)

Regards,