Meanwhile Cryptopia have been enabled lots of trade pairs, but deposits and withdrawals still down. Appears that they're moving the assets to the new safe wallets, first until then we won't be able to withdraw.
This process is painstaking process and really slow. Judging from their previous performance before they even hack they usually have a wallet under a maintenance for 2weeks to 4 weeks for a mere wallet update.
I'm not sure if you mean that this process is "generally" slow or if it's slow in Cryptopia's case.
Unless they use a couple home PCs and a DSL internet connection, they shouldn't be taking so much time to create and sync new wallets.
If they're following a special procedure which takes a long time to complete, then they should let their customers know about it... after all they just robbed them from a respectable amount of their funds.
I can only speak in general terms because I do not work there and don't know their exact process.
An exchange wallet comprises of thousands of addresses. All those addresses have to be loaded and interfaced with the exchange software (deposit engine and withdrawal engine).
Every user has a individual deposit address (unless a reference is used like with ETN). So if a coin has 20 000 users on the exchange then 20 000 deposit addresses have to be generated for that coin and interfaced with the software API.
All the old addresses have to be checked for balances and transferred to the exchange hot wallet. That process is normally done automatically but since it is unknown what the cause of the breach is - it is possible that they are checking and transferring it manually.
Cryptopia has over 2 million registered users and around 400 ? coin listings. It gives an indication of the scale of the work involved. It will involve a small number of staff because it provides access to private keys and therefore is sensitive information and security is at stake.