In his Life of the honey-voiced sophist Hadrianus of Tyre (VS 2.10) Philostratus tells his readers about an institution created by Herodes Atticus to give his teaching an edge on that of his rivals – and no doubt to entitle him to charge his pupils higher fees. It is an institution about which Philostratus was silent in his Life of Herodes himself, doubtless because he already had copious material for that Life and much less for that of Hadrianus. The institution was called the Κλεψύδριον, ‘Little Water-clock’:

This is a passage bound to catch the eye of historians of the symposium, since it seems to offer a rare indication bearing upon the matter of timing of sympotic activities, a subject on which we remain depressingly ill-informed. The combined evidence of texts, vase painting and the archaeology of private and public buildings has contributed greatly to our understanding of many material aspects of the symposium. But on the question of how long symposia lasted, and how much time any individual symposiast might expect to have to dance, to sing or simply to speak, the study of vase painting and archaeology cannot help, and we have to fall back on texts alone. I would take a bet against the discovery by archaeologists of a water-clock in an identifiably sympotic room with a dipinto or graffito explaining that it was for use in a symposium.