Here is an article on how to configure your message retry intervals. <a href=”http://technet.microsoft.com/en-us/library/aa998043(EXCHG.80).aspx”>Read this</a>
Quick answer – open exchange management console, expand server configuration, select hub transport.
Double-click your hub transport server in the middle pane. Go to the limits tab. Change your settings for retry and timeout on this tab.
More details and options are in the link above.