ANSWER:

Saying it once is sufficient. 

But there’s nothing in the Sunnah to recite a surah 100 times.

If I recite any surah 100 times, is it necessary to read bismillah every time or is it enough reading once at the beginning?

Supplications | March 17, 2019 9:08 am
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If my husband tells me to read dua (morning and evening dua) or read Qur’an and if I don’t do it he will not talk to me, so I do it am I still getting the reward of reading the dua or the Qur’an?
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What to recite when someone is sick – Sheikh Assim Al Hakeem