The last collection from a post box is stamped on the front of it, and missing it by a minute costs a day. If 11:44 am is that cut-off, the countdown here tells you plainly whether the walk is still worth making, tracking hours, minutes and seconds rather than rounding to something vaguer.
Rather than rounding to the nearest minute, the count tracks hours, minutes and seconds the whole way down, in one line. That precision matters most in the last stretch, when the minutes turn into single figures and the difference between leaving now and leaving shortly stops being academic and starts costing you the train.
Twelve o'clock is where the 12-hour clock is at its weakest, since 12 am and 12 pm are read the wrong way round often enough to cause real trouble. Writing a time as 11:44 removes the problem outright, because a 24-hour figure only ever points at one moment in the day.
Common questions
Which clock does it use?
Your own. It reads the local time and time zone from the device you are looking at, so the figure reflects where you actually are rather than a fixed zone written into the page.
Will this alert me when the time arrives?
No. It is a live number rather than an alarm — nothing rings, buzzes or notifies you at zero. If you need to be interrupted at 11:44 am, set an alarm as well and treat this page as the running total.
Is it affected by the clocks changing?
Only in the sense that your device is. When the change between GMT and BST happens at the end of March and October, the device adjusts and the countdown follows it without anything to do here.
What is 11:44 in the 12-hour clock?
That is 11:44 am, or sixteen minutes to twelve in the afternoon if you are saying it aloud. From 13:00 onwards, subtracting twelve gives the pm figure — the same moment written three different ways.