What is the sentence for aiding and abetting a money launder?

Aiding and abetting is usually dropped or dismissed for snitching (which i recommend not doing). You might get it dropped to an obstruction and get low probation. Either way best advice is don't talk to detectives, get a lawyer (or learn the law). If you've already talked to detectives then for future reference don't! They might give you rehab. Or you can bargain for that. Ive seen people get off on rehab from everything to bank robbery to counterfeiting.