Estimating and scheduling additional calendar time in preparation for electronically called meetings

Method, apparatus, and computer program products for estimating, scheduling, and tracking preparatory work associated with electronic meeting invitations. When a meeting invitation is received and tentatively accepted, preparation time for associated work is estimated programmatically from characteristics of documents associated with the meeting invitation. A floating block of time is created, subject to the constraint that it must be completed before the meeting convenes, and added to the user's electronic calendar.