It will be where it supposed to be on the screen, covering squarely the monitor's viewable area. This is represented by HGT1 and HGT2. If you're lucky, your monitor's sync pulse widths will be documented on its specification page. You'll have to do a little trial and error for this part. But most of the time, we can safely assume that a sync pulse is about 3.5 to 4.0 microsecond in length.
Some makers like to quote their horizontal framing parameters as timings rather than dot widths.
This is just HGT1. This is just HGT2. Using our example, HR is 944 and HFL is 1176. Obviously we have to do some adjustment here. The first thing is to raise 1176 to 1184, and lower 944 to 936.