So again i promise im not trying to be a dick, just helpful....Usually, not always, but usually when someone says a number of days like, shes 20 days in, they are talking about the number of days its been since they switched the light cycle to 12/12 from 18/6 or whatever. Im not sure if you knew that since you said 36 days from seed. Also the first 4 or 5 weeks after the light cycle has swithed to 12/12 is called "the stretch" bc you plant, depending on strain, will sometimes strech as much as twice as big...or more...
You might already know all this info which is why i said im not trying to be dicky, just helpful