How do you log this according to EASA.
You follow the requirements established by your National Authority
FCL.050 Recording of flight time
The pilot shall keep a reliable record of the details of all flights flown in a form and manner established by the competent authority.
But what do you write in the block off and block on time boxes?
Just because there is a box, does not mean there is any requirement to use it!
In your example, I would suggest you were a passenger throughout!