Logbook Time
Leadsled has it..
It has nothing to do with when you started the engines or when the engines stopped. It is Chocks Off (when the aircraft first begins to move under its own power), to Chocks On (when it comes to a stop). A lot of larger aircraft above 5,700 kg don't have any instruments indicating engine time, flight time etc, so they rely on the fitted timepiece.
Also remember VDO is just the name of the manufacturer so in some aircraft it will be called something different. Finally, if you apply 0.2 habitually, you could actually be falsifying hours (favourably or unfavourably) depending on what airport you are taxying at.
S