10 days or never
(h5n1) will run its course in birds in about ten days - if the bird survives (and most do) they will not be shedding virus
after approx 10 and are then no longer a risk.
Unfortunately the flu virus is fairly stable and a person can get infected after simply touching a contaminated surface. Fortunately, we haven't had big outbreaks of avian flu in the west (yet!).