The Isle of Wight coastal path is about 70 miles. You can obviously walk it in a couple of days if you're a lunatic, or you can take a month doing it if you really want to, but bear in mind that some parts of the route are very rural so don't have many accommodation options.

No, walking the entire perimeter of the Isle of Wight in a single day is nearly impossible for anyone other than an elite ultra-marathon athlete. The Isle of Wight Coastal Path is approximately 70 miles (113 kilometers) long. For a standard hiker walking at a brisk pace of 3 miles per hour, it would take over 23 hours of continuous walking, not including any stops for food, rest, or navigating difficult terrain. Most walkers complete the circular route in 5 to 7 days, averaging about 10 to 14 miles per day. The path is incredibly diverse, ranging from flat promenades to steep chalk cliffs and muddy woodland trails, which significantly slows down your average pace. If you are determined to see the whole island in a day, you would need to use a bicycle or take the "Island Coaster" bus, which offers a scenic tour of the coast. For a one-day walking experience, it is better to choose a specific section, such as the 14-mile stretch from Yarmouth to The Needles and back, which offers some of the island's most iconic coastal views without the impossible physical toll of a 70-mile trek.