It worked extremely fast for me, I took it within 16 hours of symptoms that were increasing rapidly. Within 6-8 hours I started feeling much better, instead just dealing with the Paxlovid side effects. I don’t think my body fought off Covid that fast. Anecdotal of course, but I’d take it again in a heartbeat. I did get a rebound infection the next week but I couldn’t feel it, just tested positive for a couple days.