When we calculate the delivery time to ascertain the monthly bill, we compute the total time of the .ts segments of 4 seconds of video loaded by the users watching the video.
We cap the loading time (parts of the video that have not been watched yet) at a maximum of 2 segments of 4 seconds. So the maximum impact of the loading time will be 8 seconds in case the user pre-loaded some of the content but didn't watch this pre-loaded content.