Know I have seen this before but cannot find it right now...

What is the minimum break in duty between domestic rotations? I see the PWA chart in 12.G.2... but I thought there was something else about PBS will allow builds with 10:30 in between but I can swap or pick-up as low as 10:00? or 10:15? cant find a reference but maybe someone else knows. Rules Auditor says I'm okay but want to make sure.

Thanks