I just found this great link! People documenting exposure times in their areas and homemade light boxes (with types of bulbs). Of course it is still very variable and requires experimentation. A full day to expose a print in CA?!
http://www.alternativephotography.com/wp/processes/cyanotype/the-big-cyanotype-exposure-survey-results
For me, in New Haven, it has taken from 5 to 20 minutes depending on time of year and weather.
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