TimeTraces can report per hour, day, week, month, year and for the report time period as a whole. If you e.g. choose "Days", the created report will contain one time period for each day in the reporting period you chose.
Sometimes you want to report the worked time durations in time notation (hh:mm:ss), but other times it is best to use a numeric notation (e.g. for easier arithmetic; half an hour becomes 0.5). Time notation has the advantage that it looks better in visual reports. Another advantage is that common spreadsheet applications will automatically detect that a time is involved, so they will adjust their display format to reflect this. Number notation has the advantage that it is easier to calculate with.
Before creating the report you can specify how time durations need to be rounded off. TimeTraces stores time information in detail right up to the last microsecond. For reports, it might be better to round off the durations to whole minutes or even hours.