ANSWER: You must take ghusl after intercourse before praying.  No problem in delaying it until the prayer time comes and you can do all your chores etc while in the state of major sexual impurity.

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ANSWER: Yes, they must redo the wudu before praying but this has no impact on your ghusul. 

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ANSWER: No problem if it’s normal blood as this is not impure except if it’s from the private parts.  If it’s urine or any other impurity then you must wash the affected area or change your clothes before praying.

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