According to Tide Plotter, high tide at Cowes is at 20.26 bst at 3.9m on Sunday, low water is at 01.36 and 1.4m.
Using Tide plotter, and looking for 2.2 meters, we have from 15.55 until 23.54.
Looking at the RYA/Admiralty chart for the medina, it looks as if the worst case is that it dries to 1.2m.
That gives us one metre of water to get out at midnight.
At 11.00 when it finishes, tide height should be 2.9 metres which gives us 2.9 minus 1.2 which is 1.7.
Can someone check my figures!