In which length of travel is prayer combination permitted?

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Combination of prayers is only permissible in travel that permits shortening the prayer (Qasr). The evidence is that combination is a concession granted to alleviate hardship in travel, thus it is restricted to long journeys, similar to Qasr and wiping for three days. Furthermore, combination involves delaying an act of worship past its allotted time, which resembles breaking the fast, and the reported actions of the Prophet, peace be upon him, in combining prayers were only recorded during long journeys.