How do I go about running a report on all unmanged devices in my enviroment?
I haven't looked at reporting and what options for UDD there are in a while. What do you want exactly?
Also, is this something that can be done during normail business hours or should it take place at COB
You mean running a UDD scan right? Yes, you can do it during business hours. It is network traffic and there is impact for any amount, but it shouldn't bog down your network.
If it is to intrusive, you could schedule scans at different times. Say you have 10 subnets: you can make a separate config for each subnet, and schedule each config separatly, timing the scans in intervals between 10 am and 3 pm about 30 minutes apart.
You should be able to do this by opening Tool>Reporting>Reports from your Management Console
Opening the Management Suite folder and looking in the Unmanaged Devices folder for a report called Unmanaged Devices
You can customise this report when you run it to target specific folder groupings that are in your UDD tool.