My longest cycle was 30 days when I had a bunch of high temps a couple of months ago, I usually average 26-28 days.
I have a lot of open circles due to being woken up a bunch & sometimes temping a little later trying to get as close to 3 hours of sleep as I can. Some nights I am lucky to sleep for an hour straight. There's nothing I can do about it for the time being.

I'm sure some of the lower temps in my 2ww are because of virtually no sleep, and it's why my temps are so erratic. A few months ago my chart was fine before my circus opened up in here, lol.