One week is too little time because 50% of the time that SP will be inactive and unable to upvote anyone.
I think the longer the delegation the better, and of course, if the user acts irresponsible remove the delegation no matter how much time has passed.
Many smaller delegations will have a small impact in my opinion, but if the idea is to spread the SP all around, then the smaller the better.
The criteria should be someone who usually upvotes good content and rarely upvotes himself, of course, the self vote could change if the delegation is big enough for it to be worth it.
What does supporting the community of Steem mean, specifically?
It means to behave in a responsible way, actively commenting on other people's posts, answering comments on one's posts, not ignoring people in the chat, helping newer users take a hold of the platform, and generally supporting good initiatives even if the support is small in terms of votes.
ps: wow delegating 30K SP is crazy man, who was that lucky person? :P
Thanks for the feedback. Matching criteria like that to people will take some work :P hehehe.
It was lyndsaybowes