Volunteering during high school?

<p>I am going to be a junior this fall and am hoping to attend UMich. I am in a sorta unique situation since neither of my parents can drive. I am volunteering at the local hospital this summer and will have accumulated about 30 hours by the end. How many hours do you think look decent on an application? Please give me a specific amount. Also, I have a relative who is a pharmacist. Can I volunteer at his office? Is that considered volunteering? Thanks!</p>