Steve, My garden is on a reclaimed water irrigation system, making lack of rain no problem. Yes same time line of the flowers reaching anthesis in 5 days. I would think temps around 90f and longer daylight may come into factor. Best guess for the naturally opening of the spathe would have been 2-3 days away. Here is a pic of the next spathe, looks to be same size as the cut spathe at time of cutting. Lets see how long it takes to open and reach anthesis.