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It should be said loudly

This is highly recommended

no problem.

There is no limit the only thing is that it should be even number and you conclude it with witr so that total would be odd number

If he is traveling between two cities, you don’t have to pray Juma’ah. But if you are staying in a town and the Jum’ah is called, you must attend it.

This is an issue of dispute. The safest opinion is to pray it 2 by 2.

Yes, this is the Sunnah of the Prophet salla Allahu alaihi wa sallam.