Ghost Bikes... how long should a Ghost Bike Memorial stand in place?

The Ghost Bike

A Oregon Ghost Bike Gets A Permanent Home
www.oregonlive.com

this article begs the question... "How long is an appropriate time period for a Ghost Bike Memorial to stand at its location?"

this is a MUST WATCH!
Roadside Memorials on YOUTUBE

Ghost Bikes
www.ghostbikes.org

GWADZILLA mention of Alice Swanson
gone but not forgotten