I asked CryptoMixer team about how long time the investigation will take. I received this reply from CryptoMixer team
Unfortunately we cannot provide you with exact timeframe but we can assure you that we are doing our best to process it as soon as we canLets hope for a better reply next time.
Next update will be later todayJust want to ask on why you had consider on using Cryptomixer rather than choosing Chipmixer which is more trustable and more known into this market?
For now the thing you do need is to wait into their reply and hope that you would really be get your money back.