six o'clock
Start to-morrow morning right after breakfast from in front of the cabin , and go straight up stream all day long . Only when Jack blows the horn at noon everybody 's got to stop and go ashore and eat something . Then they start again when Jack blows for 'em to . And paddle like everything all the afternoon till six o'clock . Then stop again when Jack blows , and leave every canoe just where it is . `` Then they get together and pitch tents and camp all night , and race back next day . And everybody has got to come up to where the first canoe is before they turn back .