The sunnah is to shave the head as the Prophet has made Duaa three times for those who shave their heads that Allah would have mercy on them. It is permissible to cut the hair short by clipping it from all sides. No specific length is prescribed.

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Where there is involvement of interest, a Muslim must not work there.

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If you get discharge all the time without any sexual desire then it is your normal discharge and there is no need for ghusl for this.

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Yes no problem. Since it is last third of night you can ask plenty of duaas and this is the time of seeking forgiveness.

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