When camping, the DRLs should only be on when the ignition is turned on. As others have said, they can be coded to turn off when the handbrake is applied.
What I referred to in my previous post is standard behaviour across the VW range. Pull up at the shops with the headlights on, turn the engine off, but leave the key in to listen to the radio whilst your Mrs goes in for whatever, the side and tail lights will stay on until you remove the key, or after about 30 minutes.