interval bells, and how to space them
June 5, 2026
An interval bell is a single soft strike partway through a sitting. It marks the passing of time you would otherwise have to check a clock for, and then it gets out of the way. Most sittings do not need one; some are held together by it. The skill is knowing which is which, and where the strike should fall.
what an interval bell is for
It is a quiet cue that time has passed, given so you don’t have to ask for it. There are two real uses. One is a re-anchor for a wandering mind: the bell arrives, you notice you had drifted, you return — no scolding, just a doorway back. The other is a divider, when a sitting has parts: twenty minutes of breath, then ten of metta; or silent sitting, then a few minutes of deliberate rest. For a single, undivided sit, the interval bell is optional — a convenience, not a requirement.
how to space interval bells for 20, 45, and 60-minute sits
The right spacing follows the length, not a rule.
A twenty-minute sit rarely needs one. It is short enough to hold in a single arc, and a bell in the middle can break a settling that was just taking hold. If you use one, put it at the two-thirds mark, as a gentle warning that the end is near.
A forty-five-minute sit benefits from a single midpoint bell, around the twenty- or twenty-five-minute line. Long enough that the mind will drift, short enough that one return is usually plenty.
An hour can take two, dividing the sit into thirds — at twenty and forty minutes — or one at the half, if you prefer fewer interruptions to the silence. Beyond an hour, thirds still tend to serve better than a denser grid.
Whatever you choose, the bell should be the same voice as the end bell, only softer in intent — see choosing a meditation bell.
when to leave it out
If you find yourself waiting for the interval bell, listening for it, timing the sit by it, leave it out. The point of any bell is to let you forget the clock, not to install a smaller one inside the sit. A sitting with no interval at all, just a beginning and an end, is the cleaner default; add a midpoint only when the sit is long enough that the silence genuinely asks for a seam. ZenFlow lets you set quarter-hour intervals or build a custom program, but the best interval is often none.