ANSWER: The sunnah is to wash it 3 times. However, if you washed it only once with the water reaching the scalp for sure, this is sufficient. 

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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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