Qasr (Shortened Prayers)

Is it necessary for me to perform Qasr prayers during my 3-4 day visits to my home city while I work in another city 400km away? Sayyed Mohammad Al-Musawi	How many days can I shorten my prayers if I am visiting my mother in another state for 13 days? Sayyed Mohammad Al-Musawi
Is the distance traveled for calculating Hadd-e-Tarakhkhus calculated from the end of the town or city centre? Zaid Alsalami	What can I do if I am due to miss Asr and Maghrib prayers due to travel and will reach my destination at midnight? Sayyed Mohammad Al-Musawi