if my withdrawal is hold do hacker has any chance to hack my coins ?
is it 100% safe when withdrawal is HOLD?
As Zocadas stated, no withdrawals can be processed during the time of withdrawal hold. Hold for 5 days purpose is really for security, if ever the hacker was the one who changed it, he couldn't steal the coins instantly and the owner have a chance to stop it. Only problem is when the hacker also has an access to the owner's email account, as he could confirm the pass change and withdrawal after the hold.