You can change the oil any time YOU like, as there's nothing intrinsically damaging in doing so.
The US tends to still adopt a 3-5K mile attitude and it works for them.
If you REALLY wanted to know when the oil needs changing, you'd employ the services of oil tests to see at which point the oil's reserve alkalinity was basically zero.
Honda (perhaps unlike other manufacturers?) tend to stuff the car with a high amount of MoS2, which is all well and good to protect the engine when oil isn't flowing, but does nothing for the car if the oil has become acid saturated.
In all honesty, I'd say 6 months is enough - but like all things, that'll be highly dependant on types of journeys and # of cold starts, constantly moving or stop-and-go, etc.