Reference for Chullin 5:20

המניח עובד כוכבים בחנותו וישראל יוצא ונכנס מותר

You can, however, derive it from this [Mishnah]: There is no need for the supervisor to sit and watch the whole time; even if he keeps going in and out, [the wine] is permitted!<span class="x" onmousemove="('comment',' Cf. A.Z. 61a. This Mishnah clearly teaches that going in and out is sufficient supervision even in the first instance, which contradicts Abaye. V. previous note.');">¹³</span>

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