six o'clock
`` Never you mind that , old man , '' said Dicky lightly . -LRB- But I saw that Robin was laboriously relighting his pipe and surrounding himself with an impenetrable cloud of smoke . -RRB- `` Listen to the yarn . The idea was to stake out a claim in some fairly busy road and stay there for a given time -- say , six o'clock till tea-time -- and kid the passing citizens that we were duly authorised to get in the way and mess up the traffic generally . If we succeeded we were going to write to _ The Times _ or some such paper and tell what we had done -- anonymously , of course -- just to show how necessary Champion 's Bill is . '' `` Have you written the letter ? '' `` Yes . ''