Daily for over 8 hours; Daily for 4-8 hours; Daily for 1-3 hours; Daily for less than an hour; Several times a week; Approximately once a week; Once or twice a month; More rarely; Do not use at all
Daily for over 8 hours; Daily for 4-8 hours; Daily for 1-3 hours; Daily for less than an hour; Several times a week; Approximately once a week; Once or twice a month; More rarely; Do not use at all