I don't know that the length of your corresponds with the amount of EWCM you may have, but I have noticed that the amount I have each month varies. Last month I had a lot more than I did this month, and prior to that I had even more.
Of course if your taking any medication it could affect the CM in your system (i.e. clomid)
My CM varies by cycle.
A few cycles ago it was very noticable
the next month no noticable CM
last month minimal Cm for 1 day
this month noticable for 2 days
good luck
***********SUPER STICKY BABY DUST********************
I found that taking Robitussin caugh and cold for dry coughs, chest congestion, stuffy noses helped thin out my CM. You could try another brand, but it has to have Guaifenesin in it...the Robitussin brand has 200mgs...just a suggestion.