How long can it take for dengue fever to pass?

Two weeks. Fever and most major symptoms of uncomplicated (i.e. Non-hemorrhagic) dengue will usually resolved within two weeks of onset of illness. Fatigue may persist for some days or weeks afterwards as the body recuperates from the infection.
Depends on Type. Most often dengue acute sx last 7 to10 days. Usually there is full recovery within a month. If you had dengue hemorrhagic fever or dengue shock syndrome recovery can be longer depending on complications.