I never understood this...
Flying anything over 2900 kgs qualifies as duty hours, being paid to fly anything qualifies, no matter if it is purely recreational and done for relaxation and fun...
But playing a round of golf does not.
Driving an HGV does not, even if paid.
You can also have a part time job as a cabbie, and that doesn't qualify.
But if you go down to your local parachute club and throw a few jumpers out of a BN2, it counts, as does paid glider-tugging, or instructing work...
But so long as I'm not actually flying, any other paid work is ok! Is there some logic to this that I'm missing?