---
title: "Create a Duration Custom Field"
canonical: "https://support.appfire.com/space/TTS/43877032/Create%20a%20Duration%20Custom%20Field"
format: markdown
---
> Macro (button-handy)

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> ℹ️ This page is about Time to SLA for **Jira On-Prem**. Using **Jira Cloud**? Click the **Cloud** button above.

If you have changing SLA durations per issue, you can use this function to set SLA duration dynamically. The SLA clock will count according to this field. 

To set an SLA Goal as a Dynamic Duration, you need to create a Dynamic Duration custom field within TTS beforehand. This custom field will appear only in the screens you select while creating the custom field, whether you define the SLA Goal as Dynamic Duration or not.

Here’s how to create a duration custom field: 

1. Log into your Jira account.
2. Click **Time to SLA **in the header menu to see the TTS menu, and then select **SLA Fields.**
3. Click **Add Custom Field **> **TTS - Duration Field**, and the **New TTS - Duration **Field screen will pop up.
4. Enter a name for the duration field.
5. Click **Save**.
6. The duration field will now appear in the list.

## Then, you’ll need to add the field you’ve created to your screens. Follow these steps to do that:

1. Go to **SLA Fields**.
2. Click the cog icon in the row of the TTS - Duration Field that you want the screens to be displayed on.
3. Click **Screens**, and the **Jira Screens **page will appear.
4. Tick the screens that you want to display the duration field.
5. Click **Update.**

Now, you can see the** Duration Field **in the Dynamic Duration drop-down menu while defining or updating an SLA.

![image](media://1e1a7aaa-ddd5-4ebd-b387-5dab954dc879)

## 🚀** Next Steps**

> ℹ️ **[Set a Default Value in the Duration Field](#)**

> ℹ️ **[Set the SLA Goal as a Dynamic Duration](#)**