It's common practice in the UK to log as Flight time the flight time between TO and LDG, plus 10mn ou 12 mn for taxi.
This does NOT seem legal to me:
Part FCL defines as ‘Flight time’:
for aeroplanes, touring motor gliders and powered-lift, it means the total time from the moment an aircraft first moves for the purpose of taking off until the moment it finally comes to rest at the end of the flight;