Thanks RJ.
I think my site would provide that (East facing) early in the season. Many of my hosta are starting to emerge now but a week or 2 before any leaves unfurl. Looks like your picture of First Blush at the beginning of the thread was posted beginning of June and the leaves just have a bit of purple on the edge remaining.
So I am thinking you typically get maybe 2-3 weeks of full Red/Purple blush on the leaves? Would that be accurate?