ANSWER: There are many benefits for that as various hadeeths cover it.  The prophet salla Allahu alaihi wa sallam said that the most beloved words to Allah after the Quran are these four phrases.   

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ANSWER: This is not from the sunnah and one must limit it to Tahleel only. One can offer salutation upon the prophet salla Allahu alaihi wa sallam as many times as he wishes separately. 

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ANSWER: This is more likely for it to be accepted as even in the 3 situations, one is not certain whether he was sincere or not and whether Allah accepted his duaa or not. 

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