yes, you shoud say "unstake", not "unpledge".
how many time does the 'unstaking' status need?
The unstake operation will take effect after 900 blocks. It usually takes three days.
weird,after 3 days,my unstaking balances change from 60 to 0,and available balances still 0
If you unstaked, and the wallet didn't show the returned amount, don't worry, the diskcoins are still in your wallet, it's a just showing bug. We will fix it in next wallet version.
If you want to find back the diskcoins, you can use this temporary method instead:
1. generate a new address with your wallet
2. send all your amount to the new address ( just the amount you can see not the real amount )
3. then the missing amount will be back
If you unstaked several transactions, you can do this again and again till you find all the amount back.