Egypt was 2.5 yrs old and the URI lasted for about a full month for her to recover completely. She got a red teary eye and that took a full 7 days to show any improvement. I started giving her L-lysine after the initial antibiotics and eye ointment that the vet prescribed and she hasn't had one since.
Well I found Sasha when she was about 6 weeks, stuffy nose, sneezing. She got 10 days of antibiotics and some antibiotic drops for her nose and within 2 weeks she was fully recovered. She is now almost 4 months old, no problems since.