ANSWER: No, this is not a must.  You can wash it once, twice or maximum 3 times.  https://www.assimalhakeem.net/how-to-do-wudu/

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ANSWER: No problem in speaking during wudu but you must not go for answering a phone call or door bell, or do some chore and come back during wudu, this is not permissible. 

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ANSWER: If you have done ghusl for removing major impurity then wudu is included in that and no need to repeat again unless your wudu is broken before the prayer.

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