I think you're missing my point - when I click "Unmanage", I don't want to want "Unmanage this device until:" to show the next day at the same time. I actually want it to show 1 hour from now, but I thought a better idea would be if this were a configuration option.
Having something be unmanaged for 24 hours by default is way too long. We are moving from ipMonitor to Orion and the default suspend time in ipMonitor is 1 hour. It's extremely easy to accidentally click "OK" on that screen.