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No. You can say "for the sake of myself" or "for my sake." "For my sake" sounds much better.
Sake is the correct spelling. I will answer this for your sake.
(The same spelling is used for Japanese rice wine sake)
'Sake no okawari onegaishimasu'.
酒 is the Kanji for sake.
The duration of For Her Sake is 600.0 seconds.