Be precise. A lack of precision is dangerous when the margin of error is small.

This course is very tight. The margin for error is so small here.

He's bowling 150km/h most balls. There's a very small margin for error there.

One would assume days, not weeks or months, ... I'd be reluctant to be any more precise than that.

The margin of error is so slight.

As to when the (wartime command) shift might take place, it would take place at that moment when the Republic of Korea and the United States decide it is appropriate,