Playback and Recording : Audio Recording : Setting Punch and Loop Points : Start, End, and Length Fields

Start, End, and Length Fields
In its Expanded view, the Transport window can display start, end, and length times, and pre- and post-roll settings. When setting a record or play range, the range is reflected in these fields.
 
You can enter locations in the start and end fields to set the record or play range. The Timeline Selection Markers in the Main Timebase ruler are updated accordingly.
To set the record range by entering start and end times in the Transport window:
1 To see the start, end, and length times, do one of the following:
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Select View > Transport > Expanded.
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2 Do one of the following:
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Press Option+Forward Slash (/) (Mac) or Alt+Forward Slash (/) (Windows) on the numeric keypad to select the start field in the Transport window.
3 Type in the start location and press Option+Forward Slash (/) (Mac) or Alt+Forward Slash (/) (Windows) on the numeric keypad to enter the value and automatically move to the end field.
4 Type in the end location and press Enter to accept the value.
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Use the Period (.) or Left/Right Arrow keys to move through the different time fields for Start and End. Use the Up/Down Arrow keys to increase or decrease the numerical values.