PO approval Delegation with Expiry Date

We are in a business where people keep travelling quite often and the Delegation of PO approval is quite critical as if not done at the right time then most fo the PO are in the verge of being held for approval and affects a project overall deliverable and deadline.

The Standard PO approval delegation in JDE works fine , but has anyone implemented the same with an expiry date.

Say User1 is on leave form 20 July to 30 July 2017 and he delegates all the PO approval to User 2

Is there a way in JDE that this delegation is active only till the 30 July 2017 and automatically change the the PO approval back to User1 from 1 Aug 2017.