Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.
I would wait 6 hours and then call police .. except I think a person has to be 'missing' for longer than that. They will be glad to explain that to you.
Not much else you can do that I can think of.
And, is he allowed to have cell phone calls while he's working?