Ejabberd 2.1.11 User ungracefully exits and server fails to recognize user is offline for a long time

I am running ejabberd-2.1.11 and am experiencing something a bit weird. If a user has its internet connection dropped while it is connected and online I do not see the ejabberd server recognize this user to be offline for what looks like 2 hours. Is there something I can change configuration wise?

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