  Dwell time indicates how long a user looked at a page, and this is used
especially in fields where ratings from users such as search engines,
recommender systems, and advertisements are important. Despite the importance
of this index, however, its characteristics are not well known. In this paper,
we analyze the dwell time of news pages according to category in smartphone
application. Our aim is to clarify the characteristics of dwell time and the
relation between length of news page and dwell time, for each category. The
results indicated different dwell time trends for each category. For example,
the social category had fewer news pages with shorter dwell time than peaks,
compared to other categories, and there were a few news pages with remarkably
short dwell time. We also found a large difference by category in the
correlation value between dwell time and length of news page. Specifically,
political news had the highest correlation value and technology news had the
lowest. In addition, we found that a user tends to get sufficient information
about the news content from the news title in short dwell times.
