WWD Sunday and Holiday excepted, unless used, but only time actually used to count.

When we come to the question "how much time do they actually spend on media (传播媒介) daily?", the answer is surprising: young people spend about nine hours every day using media, and this only includes media used for enjoyment.

By doing this, your resulting product will have more of the features that actually get used, and you learn which features to spend your time on.