I don't know of a way to increase the message tone time but if you are missing messages because of not hearing the tone the feature that I found most useful is that you can set the message tone to repeat periodically.
To do this go to the main menu, choose setting, profiles, select a profile (e.g. normal), scroll down the list of options until you see message alert, this will most likely say "once", tap this option and select on of the four options 1 minute, 2 minutes, 5 minutes or 10 minutes. I have mine set to 5 minutes which works well for me.
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