If you purchase the More Screenshots Add-on, you will receive 10 screenshots every 10 minutes, which means 60 screenshots per hour.

To purchase the More Screenshots Add-on, you will first need to upgrade your account to a paid plan.

After upgrading your plan, go to Settings → My Plan, and you will find the option to add the More Screenshots Add-on.

For this addon, you will pay $2 per user per month (paid monthly or annually).