Any length you want. Due any time.
Post in the relevant forum with "Scavenger Hunt" as part of the title of the post and then post a reply to this thread with the link to it.
Hope that helps.
Cheers, The Little Tornado.
The Little Tornado is ....
....
Marisa Wikramanayake
Freelance Writer & Editor,
Board Member of SoEWA and Writing WA
http://www.marisa.com.au