For HT's if you are seeing color and the sepals are not down you have maybe two to three weeks before the bloom is fully open, of course this depends alot on the weather and the variety. Usually the smaller petal count roses will open faster and roses with 45+ petals will take longer.

This last week the weather has cooled down, and the roses have also slowed down. I will go check on the sepal's stage. Interesting! This is the kind of info I was looking for. I was told perhaps that the Rose Exhibitors had some detailed info on bloom cycles from another forum. I must admit I have been growing roses for over fifteen years, and have hung out with the local rose society mostly in the summer when they are doing garden tours, or if they have a special speaker in. But the exhibiting end of things has never interested me. Now with my garden going to be on public display, I am all of a sudden very interested in how well my roses will look at a certain time. :)