Activities-Timing of Participation

<p>I had a question about how I should mark my timing of participation for an activity. I volunteered as a research intern during the summer and during the school year. I did about 20 hours/week for 8 weeks during the summer, and did about 2 hours every other week during the school year. How should I indicate this on the CommonApp. Should I just mark Year, or Break and School? Should I also elaborate in the additional information section?</p>