This refers to the duration of the rest of his life. Alternate translation: "during the whole time that my life is yet in me" or "as long as my life is yet in me"
The abstract noun "life" can be expressed with the adjective "alive" or the verb "live." Alternate translation: "as long as I am still alive" or "while I still live" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
"Breath ... in my nostrils" represents being able to breathe. "Breath from God" represents God making him able to breathe. Alternate translation: "God enables me to breathe" (See: [[rc://en/ta/man/translate/figs-metonymy]])