I'm interested in this response too.
LizzyM really stressed keeping things brief, just give a good description of what you did, and don't elaborate on how it affected you. she also suggested to leave out pronouns and write like a resume. But yeah, I'm wondering how brief is brief. Some of my descriptions are around 300, cause there's only so much you can say about volunteering before you start to list useless information if you don't talk about what it meant to you. My average is around 700-900, and my most extensive one was almost the limit.