Answer
(Fatwa: 1584/1005/L=1433)
If the husband keeps his wife at the house of his father-in-law permanently then qasr is not wajib on him. If he has not kept his wife there permanently then offering full salah there shall not be correct provided he does not intend to stay there for fifteen days and the distance is of 77.25 kms. In the same way the ruling of offering complete salah at work place is in the case when he has his property there and intends to stay there permanently. But if these things are not found then the ruling of offering complete salah shall not be applicable.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband