<prompt> Translate the following text to EnglishKama ilivyoelezwa katika sehemu ya 4.4, muda wa jumla wa ukarabati wa PJFF unakadiriwa kuwa mahali popote kutoka miezi 21 hadi 26 ikiwa ni pamoja na juhudi za kabla ya mkataba na kuanza na kuendesha.  <response>: As stated in section 4.4, the total duration for a PJFF retrofit is estimated to be anywhere from about 21 months to 26 months, including pre-contract effort and start up and commissioning. 