But "halfway to six" should be three, surely? (Sorry!) As a British person who learned Swedish -- which also uses that convention -- around the age of 10, I of

But "halfway to six" should be three, surely? (Sorry!) As a British person who learned Swedish -- which also uses that convention -- around the age of 10, I often found myself a little uncertain when hearing "half six" in English, as I grew up with the more explicit "half past six".