sad spaniel
Can't answer directly regarding DHL, but at Air Contractors we do have some standby duties for DHL, usually of a maximum of 8 hours duration. If you are in the hotel you can stay there, but if you arrive in say BRU with perhaps 4 hours or so of standby left then you usually have to remain in the sumptuous? surroundings of the EAT crewroom.
Hotels are of a good 4 (occasionally 5) star category, with breakfast included.
(As to my comment re the BRU crewroom, it's like a 0 star transport cafe, only worse!)