When setting up alarms or alerts in MetaTrader, you can specify the time frame or duration for which the alarm should be active. This allows you to define the period during which you want the alarm to monitor the specified conditions.

Here's how you can specify the time frame for your alarms in MetaTrader:

1. Open the alert settings: Right-click on the chart and select "Alerts" or "Create Alert" from the context menu. Alternatively, use the alarm or alert icon/button on the platform toolbar.

2. Define the alarm conditions: Set up the criteria that trigger the alarm, such as price levels, indicators, or chart patterns.

3. Customize the alert parameters: Specify the desired values and conditions for your alarm.

4. Set the time frame: Look for an option or field in the alert settings window where you can specify the time frame. This may be labeled as "Timeframe," "Duration," or something similar.

5. Choose the time frame: Select the desired time frame for your alarm. You can often choose from options such as "Once" (to trigger the alarm only once), "Until deactivated" (to keep the alarm active until you manually turn it off), or specific time frames like "1 hour," "1 day," etc.

6. Save the alarm: Once you have set up the time frame and other parameters, save the alarm by clicking the "OK" or "Save" button.

By setting the time frame, you can control how long the alarm will remain active and continuously monitor the specified conditions. This can be useful if you want the alarm to trigger only within a specific period or if you want it to remain active indefinitely until you manually deactivate it.

Remember to consult the MetaTrader platform documentation or contact your broker for specific instructions on setting the time frame for alarms in your particular version of MetaTrader.