Long Wake-Up Times

If I enable HDD Standby, it takes a very long time to for the drive to wakeup. When I go to access the device over the network from my media player, it doesn’t see the drive for a while (minutes). I’m assuming that it looks for the drive, it starts to wake up, but the media player (Asus O!Play) doesn’t show the volume on the network. After a while, it does.

The time it takes to wake up takes a lot longer than I would expect for a simple wake up from a suspended state. It takes longer than a full Linux cold boot. Has anyone else seen this behavior?