This has no effect on the validity of the prayer but it should not be left without shaving for more than 40 days or less if it is a lot! Kindly refer to the following link(s): https://www.youtube.com/watch?v=HyStuVZrNmM   https://islamqa.info/en/1177

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You must pray on time whether on the plane or elsewhere. If one skips prayer until the time is over, he can’t make it up and he is sinful.

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Praise be to Allah.The shar‘i texts clearly indicate that it is obligatory to offer the five daily prayers at the specified times, and that it is not permissible to put together Zuhr and ‘Asr, and Maghrib and ‘Isha’, without any excuse such as sickness, travelling, rain and the like which would make it difficult to […]

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No, this is not done before the takbeer but rather after the takbeer.

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