VDOM setup or FortiManager setup

[IrbkOrrum]

I have a single, 8 hour, professional services support day banked.  I've got a couple of options on how to use it.  I've got a FortiManager license but I've never set it up and never used it.  I would also like to configure my FortiGate that's in my DR site with a VDOM so that I could have a "bubble test" that's segregated from everything else, but uses Corp IPs.  I've also never set up VDOMs or worked with VDOMs.  I'm less than sure I can accomplish both of these tasks in 1 8 hour support day.  
Which one would you consider more complicated and I should use the support day for?