J Murphy that is large. I think the largest I've ever seen is about a cm or a bit bigger, but that size is really serious stuff.

I do have a few memories of "ouch" moments with smallish hail, half a cm or so, the size you usually see, getting caught out for a few seconds in it a few times, but like I wrote a while back, if I were ever caught out without shelter, putting a pannier or two over your head would be a good way to protect yourself while standing up. The times in my life I've seen hail come down, its always been over in a few minutes and its almost magical in how in just 5 or 10 mins later, the cold temps go away, the sun comes out and back up to summer hot temps, the hail all melts on the hot asphalt and its like it never happened.