Gift Entry timing

Hello! We are evaluating our gift entry and acknowledgement process and wonder what other companies are doing. We currently wait for the mail to come in the afternoon and enter our gifts that same day. That way, we can run our acknowledgement letters the next day in the morning and start circulating them for approvals and signatures. The tricky part of that process is that the mail never comes at the same time, so often our gift entry person is entering gifts at the very end of the day and it is hard for her to plan her time accordingly. Do other companies enter gifts the same day they are received or does anyone wait until the next morning to enter the previous day's gifts? We are thinking if we switch to doing it that way, we would delay the acknowledgements by a whole day. Thanks! Jennifer