Match speeds and vector for spacing. The basic interval where I work is 4 miles. There are many variables including wake turb spacing, wind, pilot reaction time, fleet mix, and so on. This will usually collapse to about 3 miles inside the Final approach fix which is basic IFR separation. If you are on a missed approach where I work, you'll end up in the downwind and handled like any other arrival. I will try to build a gap so you don't have to go to the end of the line. Therefore I vector for an 8 mile interval and fill it with your airplane. If I want to put 2 aircraft in it becomes 12 miles and so on.