Honestly, wear them whenever you wish. It's a great accomplishment and you should wear it proudly.
Personally, I try to not wear any while working. It helps me avoid the inevitable, "you've got THAT many 300's and you're not a pro?" conversations that take place when someone notices them. Please, don't take that the wrong way. There's been plenty of changes to the game that have made honor scores
seem a little less honorable. They're still an achievement that the vast majority of people that take part in the sport will never accomplish.
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Return with your shield or on it. Strength and honor.
"I'd give my right arm to be ambidextrous."-Nick Faldo
Me MTIXE