How long does it take for Hyaluronidase to work?

In my experience 2 to 3 days. It varies from individual to individual and also depends on the dose. Try to undergo small amounts of injections to see if it works well for you. It can sometimes work too well and absorb all the Hyaluronic Acid. If that is your intent, then go ahead. However, sometimes patients like the results but have a small bulge which needs to be flattened.In that situation it is better to start with small amounts and then titrate it based on the response.
Regards

Much of hyaluronidase will take action within the first 24 hours of injection. Additional absorption can occur over the remaining 2 weeks. Keep in mind swelling, irritation at the injection site and some pain can occur when injection of hyaluronidase. Be sure to consult with an experienced practitioner before having your filler dissolved.