How long can the president order troops to spend how long in a particular place without congressional approval?

The president can deploy troops without congressional approval for up to 60 days under the War Powers Resolution of 1973, after which he must seek congressional authorization to continue the military engagement. An additional 30 days may be granted for the withdrawal of troops, totaling 90 days before Congress must be involved. However, this resolution has been subject to debate and has not always been strictly adhered to by presidents.