We don't allow to book for less than two hours. How can we validate it?

Let's say you have a 24-hour hourly rental.
1. Create a new reaction.
2. Enter the name.
3. Select the type - Error and enter the message text about the minimum duration.
4. Click Add condition.
Pick a Duration condition. Specify the number of steps so that the message is displayed when booking is 1 hour long or less. Apply the condition and save the reaction.
Check the result on the widget. Try to book only 1 hour:
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