# File lib/fog/profitbricks/models/base.rb, line 5
        def wait_for(timeout = Fog.timeout, interval = Fog.interval, &block)
          reload_has_succeeded = false
          duration = Fog.wait_for(timeout, interval) do # Note that duration = false if it times out
            if ready?
              reload_has_succeeded = true
              instance_eval(&block)
            else
              false
            end
          end
          if reload_has_succeeded
            return duration # false if timeout; otherwise {:duration => elapsed time }
          else
            raise Fog::Errors::Error, "Reload failed, #{self.class} #{identity} not present."
          end
        end