How do you say 一か月ほど先で結構ですから、推薦状を書いていただけないでしょうか ik-kagetsu hodo saki de kekkou desu kara, suisenjou wo kaite itadakenai deshou ka in English?

It's fine being (about) in a month (ahead one month) but, could I please (humble-polite receive) have you write a letter of recommendation for me?