How many XDN will I need in my wallet? - Any amount, the question is how long should your XDN to be "on hold" or "sleep"

There are several ways of PoS implementation with CN technology, as well as several ways of PoS block rewards. All specs will be discussed with the community, like % of interest and other aspects.

Possible PoS implementation ways quite simple and smart:

1. New blocks are Hybrid PoS/PoW. PoW block rewards = 150 XDN. New PoS block reward = % of coins "staked in proof" or % of annual emission or fixed 150 XDN block reward, or fee, or mix of above - new emission, that will decrease full XDN emission up to 33 years.
2. a. Automatic PoS - each XDN unit that is on hold for E.G. > 7 days is involved in PoS
    b. Bank - alike PoS - some kind of "holding deposit" that owner choose via GUI. E.G. I want 30% of my current wallet amount to be involved in PoS. 

2.b. Possible implementation is to keep "on hold" XDN visible for network but still "anonymous". E.G. Bob can say: 6.900.000.000 XDN units emitted, but 3.000.000.000 XDN are on "hold" (Involved in PoS) and 4.900.000.000 XDN are in circulation.

To be continued ...