Everybody I met told me that I HAVE to do this hike but I have to wake up very early, sunrise time.
After doing it, I cannot recommend it more. The hike is 15km and about three hours with breaks. Not stoping is not possible as the views are jaw-dropping. I got to this little church and saw Oia lit by the sunrise light and was instantly in love.
The waking up early part is essential. if you start it later you will be caught by the heat and that makes for a very unpleasant experience. Doing this early also ensures that you are alone on the well traveled path.
The only complaint I have is that the path is not well marked so having a gps will help. Luckily we had it on our phone.