Will the Dajjal remain for 14 months and 14 days, based on the hadith: "Forty days: a day like a year, and a day like a month, and a day like a week, and the rest of his days like your days?"

The hadith mentioned in the question is authentic, and its meaning is to be taken literally. The first day will be as long as a year, but its characteristics will be those of a normal day. Therefore, prayer times must be estimated for it. Al-Nawawi said: "When, after the dawn breaks, a period equal to that between dawn and Dhuhr of any given day passes, then pray Dhuhr. Then, when a period equal to that between Dhuhr and Asr passes, pray Asr. And when, after that, a period equal to that between Asr and Maghrib passes, pray Maghrib. And similarly for Isha and Subh, then Dhuhr, then Asr, then Maghrib, and so on until that day ends, and prayers equivalent to those of a year have been performed within it."