Varying hours/week spent on extracurriculars?

I was wondering how most people deal with having varying amounts of time spent on extracurriculars in the Common Application, when it only seems to allow numbers in the field for it. For example, I spend about three hours a week on a certain extracurricular when school is in session, but about ten when on breaks–this feels like a significant difference, and not one well served by just averaging the numbers together. I also spent up to thirty hours a week on a similar extracurricular this summer, and with the limited number of activity slots, I don’t want to “waste” one on what is mostly a variation on the same extracurricular just to be able to give a different number of hours per week. The character limit is very short, too, and I’m having a difficult time just fitting in the varying numbers in my description of the activity. Thoughts?

bump

Just provide a rough estimate to the best of your abilities. It’s not a very major factor.