The Blood Sugar Diet does not focus on quantity of carbs. It focuses on quality – nonstarchy, complex, legumes, and making them a taste – not the whole meal.
Any advice about specific quantities you receive (and you likely will) comes from people experimenting to find out what works for them. So it is a personal limit, not part of the diet.
My own personal limit, until I started this diet, was 20 carbs in a 3 hour period. I still generally stick to that, since I know it is safe in connection with my blood glucose. I have tried to stick to the spirit of the diet, which does include more carbs than I can usually tolerate – and just last night had a 30 carb meal (primarily from chick peas and non-starchy vegetables). My BG peaked at 5.39. 🙂
My advice is to follow the recipes, and perhaps the menus, and not fixate on quantities of carbs you are eating – unless you are having a blood glucose response that troubles you.