> For the complete documentation index, see [llms.txt](https://docs.tachyon.video/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tachyon.video/user-guide/4.-programming-a-show/timeline-editor/timeline-duration.md).
# Timeline Duration
The Timeline’s duration is determined by the Sequence’s duration. By **default, a Sequence has a duration of 2 hours**.
{% hint style="info" %}
Every newly created Sequence will have this duration if the default value isn’t changed.
{% endhint %}
## Change the Default Value for Sequence Duration
1. Open the Settings module by pressing **`Alt`****+****`S`** or by selecting **{System > Settings}**.
2. Click on the **`General`** tab.
3. Select **`Timeline`** in the list.
4. **`Click`** on the Sequence time input box located underneath the Timeline window section to edit its default value.
5. **Enter the new default values** for Sequence duration using the keyboard. Values are expressed as follows: *hours:minutes:seconds:frames*.
## Change the Duration of a Sequence
1. **`Right-click`** on the Sequence tab to open a contextual menu.
2. Select **{Properties}** from the menu; a Sequence Properties window will open.
3. **`Click`** on the Duration time slider to edit its default value.
4. **Enter the new default values** for Sequence duration using the keyboard. Values are expressed as follows: *hours:minutes:seconds:frames.*
5. Click on the **`OK`** button. The Timeline will be extended or reduced to match the Sequence’s duration.
6. A dialog box will open to tell you if some Clips are out of range now that the Sequence duration has been altered.
{% hint style="info" %}
This is non-destructive; if the Timeline’s duration is returned to its original format the Clips will be reintegrated.
{% endhint %}
{% hint style="info" %}
30 hours is the maximum duration for a Sequence because this is the maximum value for Timecode data.
1 second and 1 frame (00:00:01:01) is the minimum duration for a Sequence.
{% endhint %}