Mirror hours: the full list, and what makes each one readable
Not all repeating times are equally visible. The pattern has to be readable at a glance to be noticed at all.
Three kinds of pattern
Repeating times fall into rough families. Doubled hours, where the hour and minute match, such as 11:11 and 22:22. Mirrored times, where the minute reverses the hour, such as 12:21 and 21:12. And sequences, where the digits run in order, such as 12:34 and 23:45.
They are not equally noticeable. A doubled hour is recognised instantly. A mirror needs a beat of processing. A sequence sits in between, helped by how familiar counting is.
Why readability decides which ones people care about
A pattern only becomes a habit if it can be spotted in the half second someone glances at a clock. That is why 11:11 dominates the conversation while equally symmetrical times go unremarked.
It also explains why the round hours hold their own. 00:00 is not a mirror or a sequence, but it is the most legible time on the clock and it marks the reset of the day.
The ones people ask for
In practice a short list gets asked about repeatedly: the doubled hours, midnight, the counting sequence, and the small set of times that carry meaning from outside the clock entirely.
Each of these is a single minute like any other, and each can belong to one person.