Planar Time (PWH)

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How does a body know what time or day or even year it is on a plane that's always dark or always light? Without a sun or stars, how can time be measured? The simple answer is, it isn't. That answer is enough for some sods, but most (particularly primes) want some way to keep track of time's passage.
Sigil Standard Time (SST, as the Guvners call it) is normally used by planewalkers. It sets a standard length for minutes, hours, days, weeks, months, and years. The City of Doors has a regular, repetitive cycle of light and darkness. Each is about 12 hours long, so a Sigil day is 24 hours long. Cagers call the hour in the middle of the light period "peak," and its opposite at night "anti-peak." 
Still, with clocks being rare in most places outside of Mechanus, these lengths of time remain approximate. Most berks know about how long an hour or a day is, and keep track of time no more formally than that. This means that if someone says "I'll give you your goods in a week," a body might get what he wants in five to 10 real days. 
A few planes have sunrise and sunset (or at least varying periods of light and darkness) that approximate Sigil's days. Most, however, do not even have varying days and nights, but remain more constant in the intensity of their light, whatever the source may be. Some planes have no light at all. 
For longer lengths, time is measured in units relating to a specific event: "in the second year of Facto! Hashkar's reign," for example. In fact, the reigns of the Fraternity of Order's factols are the most common benchmarks, since they're the cutters most concerned with keeping records straight. (Guvners mark this year as the 128th year of Hashkar's reign.)