You're traveling a distance of 4 miles on this moderate trail. The hike is therefore not too long. Average length of all hikes in Tyrol is 9 miles.
Hiking boots are not required, but the hike might be more enjoyable with sturdy footwear (especially in wet conditions). If you get hungry along the way, there are places to rest and get food. Nevertheless it’s recommended to also have enough water and food in your backpack when hiking or biking.