Does Southern Blockade stay in play until the end of the game?
Southern Blockade
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Does Southern Blockade stay in play until the end of the game?
That or until something removes it. Entering play is an instantaneous effect (http://rules.l5r.com/CE_Effects#Instantaneous_effects), which has no duration.