I arrived at the figure of 200ms by watching the onscreen metronome in BIAB as it counted 1,2 1,2,3,4 and listening to the midi drum count-in. It was obviously off so I adjusted the latency so they matched. I guess you could also by clicking on the Latency Adjust... in BIAB under MIDI/Audio Driver Setup.
That figure of 200ms applied to my particular setup. Don't be surprised if yours is either different or does not even need to be changed at all.
Also, BIAB has a habit of periodically letting me know that VMS is a software synth and the latency should be set to Zero. I just ignore that and I wish it would mind it's own business about how I set things up.