There are two times for Asr; preferred time and this is from athan of Asr until the sun becomes yellow and one can look at it. The second time is a time of necessity and this is not recommended and it is from the time the sun becomes yellow till it sets!

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No, you should not pray as there isn’t any legitimate reason for doing So and there is no prescribed sunnah before Asr!

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If you are referring to Duha prayer, this is an authetic sunnah! But the prayer between Maghreb and Isha is not authentic!

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