The Tsunami first hit land at 09:53:36 on Boxing day 2004. (Australian Time) Posted by the GMTCRO of Geography.
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I'm not sure but what I know from the delivery man that was emersed in debris (Romi) that it lasted for days maybe even weeks so i think it lasted 1 week
The Boxing Day Tsunami started on December 26th, 2004 and lasted 7 hours. It started at 7:59 am, so it ended probably around 2 pm. I have not come across actual information, this is just context clues.