Graph to show product down time

[kn8da]

I am interested in showing a gadget with a product down time graph for the last 90 days. I have written a query to grab all severity one tickets but when I try to use a report or graph it only lets me use data on a day basis for this time period, so tickets that are only open 30 mins are not showing up. Anyone know of a way to do this? Thanks.

[GabrielleJ]

What do you mean when you said "it only lets me use data on a day basis for this time period"? Can you elaborate more? 

Alternatively, create and save your own JQL filter so the gadgets can use that data.