Have you tried creating a calculated field in the criteria with the difference between the two dates, you should then be able to plot this measure
I do not know how I could create this with the difference between this two dates? unfortunately i have been able to have count considering the open and close month of the same Graphic. How I could create the criteria and make the count one considering the column of create and the other close?
I have the same issue now. Did you find a solution to put the count on the same graphs ? regards