3 hops for something like an exchange, and 5 hops for something like a government (since a government has more resources) That's what is supposed to be but generally, it's the opposite. Most governments have fewer resources than companies using blockchain forensic companies.
But don't governments merely employ commercial blockchain trackers in any case (unless it were something like the NSA who'd hire dozens of specialists to build their own tool)?
A tool from such an agency as the NSA would merely be used as surveilence, without making official memoranda to avoid giving away the existence of their tool.
But if a govt. merely wanted to track down a bunch of cyber thugs it is much easier for them to order a commercial entity like Chainalysis to do it (less legal paperwork and allowances required in that case).