I think they idea of a min and max is misleading. As you mentioned, it is time dependent. It should be thought of as a sloping line on a graph over time.
I know people want to simplify to gain or give understanding. But radiation is a cumulative effect, very time dependent.
Understanding that helps people realize how the workers can survive in “unacceptable” high levels to supply water to the pools and the like.
Cheers
Thank you for your reasoned comments.