There doesn't appear to be any rhyme or reason to it. I've had it where I missed a day and they cut me to 2, I was out of town yesterday and they left me at three,
I've had at least one a day for 4 days. The first time it wasn't bad at all, then I softened it the next day and the next. I have one coming out tomorrow I'm going to link all 3 on. :)