Incubation time for this medium is 1 week. under what circumstances would an early reading be allowable? not allowable?

If the incubation time for the medium is 1 week, then early reading is allowed only if the incubation space is aseptic and the sample is not vulnerable to exposure. Sensitive samples are not advised to be opened earlier than their incubation time since it will result to contamination.

pls where is the image I can't see any image