A method for managing processing of electronic messages. The method includes a computer processor identifying one or more electronic messages. The method further includes a computer processor determining one or more e-mail characteristics respectively associated with the identified one or more electronic messages. The method further includes a computer processor determining an estimated electronic message processing duration for the identified one or more electronic messages based, at least in part, on weighting factors that are associated with the determined one or more e-mail characteristics. The method further includes a computer processor identifying a first unscheduled time slot within an electronic calendar of a user. The method further includes a computer processor scheduling the identified one or more electronic messages within the identified first unscheduled time slot of the electronic calendar of the user.