four o'clock
About the middle of one side was a solid , square mass of stone that looked as if it might have been the base of a forge or smelting-furnace . But there was no chance to proceed further , for Ranny suddenly jerked out his watch and gave an exclamation of dismay . `` Gosh ! Almost four o'clock . We 've got to start back right away . '' `` Aw -- gee ! Let 's take just a few minutes more , '' begged several voices at once .