Rules regarding the Days After Ten Days
Issue No. 1170- If a traveller knows, for example, that ten days or more remain before the month ends, and decides to stay at a place until the end of the month, he should offer complete prayer. But if he does not know as to how many days are left until the end of the month, and decides to stay until the end of the month, he should offer complete prayer if in fact there remain ten days or more until the end of the month.