In Nintex Workflows you can define when the workflow will execute in the context of the the business entities “working hours”.
When refering to business hours, these are the hours of operation defined in Site Settings > Regional Settings of the site where the Nintex Workflow resides. You can also set your public holidays which can be included through Site Settings > Manage Holidays
Also – a special tip – (thanks Colin for clarity) – although the Pause Workflow action can be set to 1 minute in it’s settings, it will actually never execute in less than 5 intervals as it is dependent on the SharePoint time job. Important to remember as you may be wondering why your workflow takes ages to finish if you try and insert <5 minute intervals. It is actually 5 minutes + the duration of the workflow sequence + the minute interval you selected.