Mandarin-invest.com administration provides an explanation of their policy related to processing withdrawal requests:
LibertyReserve payouts are now processed instantly. You do not have to wait for your payout to be processed any longer, it will be processed automatically after request. For security reasons we have limited the instant withdrawals to $100 per request. In case the requested amount is greater, it will be processed manually. We also plan to add instant payouts for PerfectMoney and StrictPay within the next few days.