ANSWER:

This is an innovation. 

You can send salutations upon our Prophet salla Allahu aliaihi wa sallam anytime and as many times as you wish, however you shouldn’t specify a number. 

I have maken a habit after every obligatory(fard) prayer i use to read 10 times salaa on prophet Mohamma PBUH, is that an innovation?i am doing it with azkaar after prayer.

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