"for one thousand two hundred and sixty days" or "for twelve hundred and sixty days" (See: [[rc://en/ta/man/translate/translate-numbers]])
# days, clothed in sackcloth
Why they will wear sackcloth can be made explicit. AT: "days, wearing rough mourning clothes" or "days: they will wear scratchy clothes to show that they are very sad" (See: [[rc://en/ta/man/translate/translate-unknown]] and [[rc://en/ta/man/translate/figs-explicit]])