Systems and methods for serving online content based on user engagement duration

A method, comprising:

• receiving, by a content serving computer system from a user access device comprising an audio codec, digitized audible information from a user, the digitized audible information comprising a request for a first content item;
• identifying, by the content serving computer system, the first content item based on the digitized audible information,
• receiving, by the content serving computer system, for each of one or more additional content items related to the first content item, consumption data,
• based on the consumption data, determining, by the content serving computer system, a duration within which to initiate presentation of a second content item;
• transmitting, by the content serving computer system, the first content item to the user access device for output, and
• providing, by the content serving computer system, the second content item for output by the user access device within a time period having the determined duration and starting when output of the first content item begins.

A non-transitory computer-readable storage media having computer-executable instructions embodied thereon, wherein, when executed by at least one processor, the computer-executable instructions cause the at least one processor to:

• receive, from a user access device comprising an audio codec, digitized audible information from a user, the digitized audible information comprising a request for a first content item,
• identify the first content item based on the digitized audible information,
• receive, for each of one or more additional content items related to the first content item, consumption data,
• based on the consumption data, determine a duration within which to initiate presentation of a second content item;
• transmit the first content item to the user access device for output, and
• provide the second content item for output by the user access device within a time period having the determined duration and starting when output of the first content item begins.