Is the active ingrediant in it not test proprianate. If so, proprianate should be at a low enough level to pass a urine test. Your T/E ratio should be under the 6:1 ratio and propianate should be at a low enough level that it would not show up. Even if it did show up they would not test for the metabolites if the ratio was in range.
Even so, you should shoot for 3 weeks and dilute your urine just in case. There are some other steps which can be followed to help. If you think you need them let me know and I will post it.
Nautica