sorry my bad, it was 48 hours window after infection, it has been so long since I took Relenza, I forgot, anyways you should take it as soon as possible, but if, like ditch handle, you'd rather play around with your life before the 48 hour limit is up before taking Relenza after an infection, it's entirely up to you
Relenza information from the manufacturer
http://us.gsk.com/products/assets/us_relenza.pdf
Tamiflu is different again, I have not taken Tamiflu before. I can assure you my flu went away very quickly after taking Relenza, but as the doctor said I was within the window after infection, oddly, I caught that flu in one of my flights.