Key points are not available for this paper at this time.
Daniel R. Anderson, Diane E. Field, Patricia A. Collins, Elizabeth Pugzles Lorch, John G. Nathan, Estimates of Young Children's Time with Television: A Methodological Comparison of Parent Reports with Time-Lapse Video Home Observation, Child Development, Vol. 56, No. 5 (Oct., 1985), pp. 1345-1357
Anderson et al. (1985) studied this question.