A presidential pocket veto is automatically triggered if the president does not act on a given piece of legislation passed during the final ___ days of a legislative session.

ten

Explanation:

A veto is a constitutional right or power that to reject or stop an official decision or legislative action. It is the mainly the rejection of a legislative policy or law.

A pocket veto is the automatic rejection of a bill which will occur if the governor or the president neither rejects nor passes the bill by signing it within 10 days after receiving the bill, when the congress does not meet.

The President of United States enjoys pocket veto power by sitting over the bill for ten days.

Hence the answer is - --

ten