Please guide me with references of Quran and Hadith the exact timings of Asr prayers (start and last time)
بسم الله الرحمن الرحيم
According to Hanafi Fiqh, the time of Asr starts from Misl-e-Sani (when the shadow of every object become double after its original shadow) and ends at sunset. For reference and details, please see Ilaus Sunan and Fathul Mulhim.
Allah knows Best!
Darul Uloom Deoband