2. The computer-implemented method of claim 1 , wherein the particular portion comprises the first portion, the method further comprising: subsequent to expiration of the respective determined amount of time, displaying the second portion of the first document to the user through the GUI for the respective determined amount of time.
2. The computer-implemented method of claim 1 , wherein the particular portion comprises the first portion, the method further comprising: subsequent to expiration of the respective determined amount of time, displaying the second portion of the first document to the user through the GUI for the respective determined amount of time. 3. The computer-implemented method of claim 2 , further comprising: receiving feedback from the user during display of the first or second portions of the first document through the GUI for the determined amount of time; based on the received feedback, adjusting the respective determined amount of time; and displaying a third portion of the first document to the user through the GUI for the adjusted amount of time.