How long could Japan be isolated?

Lets say that somehow the oustide nations decide that they will not bother Japan at all.
How long could Japan stay isolated without outside influence?
 
Not much longer. Even if a foreign power doesn't open them up, there would be an internal rebellion eventually. There were always elements in Japan who wanted to open up and knew the dangers of not doing so. It all depends on how long those elements can be suppressed.
 
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