Rule of Thumb for Mouse Bites?

Creating a PCB that I envision as normally being attached, with a section that can be broken off and discarded in certain circumstances. At this point I'm just doing a V-score, which might be the correct solution, but if I wanted to do mouse bites do people generally have a footprint that they use (KiCad in my case)? Or is there a rule of thumb for drawing them in? Thx!