How long does it take for a bladder to become a kidney infection?

Didn't understand: I am sorry, it seems something missing here. Please clarify the question.

Variable: This depends on many factors such as your age, other medical conditions such as diabetes, hypertension, etc and the presence of other anatomical abnormalities such as blockage, scar tissue, stones in the urinary tract etc. If no confounding problems, this make take some time, probably over a week. Its best to treat as soon as possible to prevent kidney infection because these are much more serious.

Variable: Sometimes no time at all if bladder reflux is present. Otherwise depends upon the bacteria. For instance, some strains of e. Coli + bacterial species have cilia, which are like tine hair projectios from cell wall, enabling to creep like caterpillars up to the kidney.This can occur over a metter of hours or days.