I have an account with 90 eos staked for cpu bandwidth, and it shows 7 ms used with this account. My question is that is it possible to unstake all the 90 eos?
The unstake command will become available after at least 15% of the total token holders vote on the chain. Right now, were almost at 7% (https://eosauthority.com/voting), so no one can unstake their tokens. Thomas Cox elaborates on this in his post Magic 15%.
"And even after we hit 15% and the “unstake” command becomes available, it takes three days for unstaking of tokens used for CPU or bandwidth."