1. A method, comprising: receiving a request from a user to access a content feed; based on a time of receipt of the request, identifying a current seasonality, wherein the current seasonality corresponds to reading habits of the user during a time period encompassing the time of receipt; accessing a profile for the user to obtain a reading speed of the user and the reading habits of the user for the current seasonality; identifying a subset of content items in a content store for inclusion in the requested content feed; estimating a reading session length for the user from the reading habits for the user for the current seasonality; determining a complexity, with regard to the user, for each content item in the subset of content items; creating the content feed by ordering the subset of content items according to the reading session length and the complexity of each content item in the subset of content items; and delivering the content feed to the user.