30 Day Timer attached to an Approval

[golfnutt82]

Hello,
What is the best way to handle an approval situation where the approver doesn't take action for 30 days?
I have an approval that uses a reminder.
I use a do until loop to check the value of a Boolean variable.
I then set the frequency and the amount of time using a delay.

A reminder email goes out with a link to the actual item that the user can use to approve or reject the item.

All of this works great but what if the user doesn't do the approval? 
I would like to use a 30-day check if the Boolean variable doesn't change to true then do another different action.

Your thoughts?

Thank you!