Etiquette for email asking graduate administrator to contact my reference regarding a deadline extension
The letter looks fine. However, it seems strange that the professor would involve you to intercede on his behalf in asking for an extension. Surely he can't be that busy! (I disagree with phys_chem_prof on the amount of time needed to write a reference letter. I would estimate writing a convincing letter to take the better part of an afternoon.) Unless this letter is crucial and the grace period asked for is not more than a few days, you may be better off approaching some one else, even at this late date.