Sort:  

What do you mean about expiry? Your steem power is your invested steem in Steemit. You can power down your account for steem. This process takes I think 9 weeks total? You get a certain percentage out (1/9th) out every week.

You can upvote seven 100% upvotes per day without loosing to much power.

Coin Marketplace

STEEM 0.19
TRX 0.18
JST 0.034
BTC 90139.92
ETH 3237.87
USDT 1.00
SBD 2.79