Counted repetition of one short phrase, on the fingers or a knot cord, spoken, then whispered, then silent. A counter that works like the cord, a stage you set, and the tradition's own warning on the screen every time, because it says this must not be done alone and a page can only be used alone.
The tradition's own rule, every session
The writers who kept this practice say plainly that it is not to be taken up without an experienced elder, and they have a word, prelest, for what it produces when done wrong: warmth, lights, a sweet certainty, taken for progress and diagnosed by them as delusion. This page is unsupervised by definition. It cannot tell the two apart, and neither, they say, can you. If the practice starts to produce experiences, stop counting and find a person.
The cord
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One tap per repetition. The phrase is yours to choose; the page does not supply one.
Rounds
The honest limit, stated first. This is the strongest honest limit in the book, because the tradition supplies it: do not do this alone. The physical method, breath and posture and the descent of the mind into the heart, was mocked at Constantinople as navel-gazing and defended by Palamas at councils in 1341, 1347 and 1351 that were won politically as much as theologically. The Philokalia was printed in Venice in 1782, the Slavonic in 1793, and the little book that carried the prayer to most English readers, from Kazan in 1884, has no settled author, and most of them met it in a Salinger novel, which is not a lineage. None of that is an argument against the counting. It is an argument that the counting was never meant to be the whole of it, and this page, which is only the counting, says so at the top of every session.