anchor: 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.
positive: According to section 4.4, the total duration for a PJFF retrofit is between 21 and 26 months.
negative: Section 4.4 states that the total duration for a PJFF retrofit is about a month.