Your scheduled work time has nothing to do with your compensible time; nor does whether you use their computer or yours, or work onsite or off. If your employer instructs you to write and send a report or email, that is work, and you must be paid for all time spend doing it, as you are paid for all time spend working (assuming you are hourly; if you are salaried, then you are paid the same weekly salary regardless of how many hours you work). So say you draft and send the report from 7:30 to 8; work from from, say, 9 to 12:30; take an hour for lunch; then work from 1:30 to 5:30--you would have worked 8 hours and should be paid for 8 hours. If you worked instead to 6, you worked--and should be paid for--8.5 hours.