I understand you can walk out to Hilbre Island at low tide. If the tides times are as follows:
03:39 7.28m H 10:15 3.22m L 16:09 7.00m H 22:55 3.55m L
I would imagine at 10:15 it would be fine to walk across but at 16:09 it would be impossible to walk across. However, approximately what be the latest you could walk back without risking being stuck by a high tide?