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In regards to kosher supervision, what is the largest single gap that a mashgiach can leave the premise and still be considered practicing יוצא ונכנס?

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My maggid shiur in Yore Dea said: "It's called 'yotze v'nichnas', not 'nichnas v'yotze'. I.e. the mashgiach may only leave occasionally!" – Adám Mar 28 '14 at 14:58
The Rambam calls it Nichnas v yotzei. (Machalot Assurot 13:3 plus many more places there) – Yishaq Mar 30 '14 at 4:49

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