Problems with client disconnection from wcf callback service.

I am using WCF callback services for Real-Time User availability and text/video chat application and i have included reliable session with a receive timeout of 10 mins.The problem i face is when a message has to be broadcast for all users(say 10 users) i am using a for loop and if a client has disconnected from internet on his side the loop waits for 10 mins to reach the same client without broadcasting the message to other clients.
 Is there any alternative or a better approach for accessing other clients in the meantime or any work around.
danny sAsked:
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