<prompt> Translate the following text to EnglishUtafiti wa kawaida wa huduma unahusisha idadi ya siku za utoaji, lakini wauzaji wanaweza pia kuwa na nia ya kufikia utoaji kwa tarehe fulani au hata kupunguza hatari ya kipande hicho kupotea kwenye barua.  <response>: The most common service consideration would involve the number of days to delivery, but mailers can also be interested in achieving delivery on a certain date or even in reducing the risk that the piece is lost in the mail. 