# Duration Time Scale

Use this feature to specify the time scale used to measure the duration of exposure.

Duration of exposure refers to the total length of time during the study that a subject underwent treatment and it is based on the recorded exposure times to the drug. Duration lengths measured in the time metric specified in this option are summarized both in the static report and on the Duration Distribution tab in the JMP output tabbed report.

Available time metrics are listed in the following table:

Time Metric | Function
Days |
| • | Choose this option to measure total duration in days.
| • | This option is specified by default.
Weeks |
| • | Choose this option to measure total duration in weeks.
Months |
| • | Choose this option to measure total duration in months.

Note: Not all time options are available on all reports.

### To Specify the Time Scale:

| 8 | Click the appropriate radio button.