I am unsure what defines a re-blooming daylily. Is it is single fan that produces another scape or different fans of the same plant that produce scapes and blooms at different times?
Something interesting that I noticed in my garden.... I separated fans in various clumps of seedlings this year and replanted them in different beds. I noticed that they all started producing scapes and blooms about the same time. They definitely have a set time frame to bloom!