Just to put a dot on an 'i' and for future discussions and calculations :-)
The find of the wreck was published yesterday. Which was June 15th and Day 28. Close to the 30 days.
Suitably equipped detection ships sail at approximately 10-12 knots and may require a port visit before proceeding to the area.
The BBC quotes 'experts' who say that the box pingers were expected to stop at the 24th of June. Which would have been Day 37.