What is the maximum number of days the President can keep military forces deployed without notifying Congress?

The maximum number of days the President can keep military forces deployed without notifying Congress is 60 days, which is established by the War Powers Resolution of 1973. This legislation was designed to check the President's power to commit the United States to an armed conflict without the consent of Congress. According to the resolution, the President can introduce armed forces into hostilities or situations where imminent involvement in hostilities is clearly indicated only after consulting with Congress. If Congress does not grant authorization for the use of military force, the President must withdraw those forces within 60 days.

The 60-day limit ensures a balance between the President's ability to act swiftly in defense of national interests and Congress's constitutional authority to declare war and control military operations. If the deployment exceeds this timeframe, the President must seek Congressional approval to continue military operations, thus reinforcing the principle of checks and balances inherent in the U.S. government system.