3) Duration of Infected Edges Condition: Infected Edges last between a few minutes and a few hours real life. The longest observed, continuous continuously Infected Edges event I've observed, lasted about 23 real life hours (8 hours logged in). Note these times are when I just happened to noticed it and examine. Once you get an infection, the duration and whether it gets better or worse seems to be random and most of the infections I observed only got better.
The time between when you get the original wound and when an Infected Edges starts, also appears to be random; I've gotten them 10 mins after getting a wound and after several hours. Infected Edges have also been observered to appear and dissapear on the same wound 2 or 3 times over several real days.