How long does it take for amoxicillin to heal an infected dog bite?

Hello
Sorry I didn't respond to this question sooner. Hopefully your well on your way to recovery.
First and foremost, I hope you asked if the dog that bit you had all of his shots?
Second, if you haven't had a recent tetanus shot (within 5 years) I would advise you to get one.
As to the duration of the infection. If the dog bite wasn't a deep bite nor a non-jagged bite (no stitches involved) I would expect the infection to clear up in approximately 10 days.
The 10 days is provided you took the complete Amoxicillin prescription as prescribed.
Lastly, you mentioned pus was visiable. The pus is important. Make sure you tell the doctor who treated the bite about the pus. If it's not too late and the wound is not responding to the Amoxicillin then it would be best to take a biopsy of the puss. Therefore, the doctor will know the exact bacteria he or she is dealing with and then can prescribe the appropriate antibiotic.
Best regards
bestpup