What started as a small (a few days) break from blogging changed into a one-week absence. When I am posting every day, the brain keeps track of its sweat and starts perceiving the blogging history as a long chain of work, even if the topic is mundane. Thus I remember those days as "long". When I take a break, the blank period somehow gets tossed away and the most recent "brain sweat" moment is glued to the latest one, which is now. Thus, the blogging off-season passes away in a blink.
I have read that the brain does not record what we experience "as it was" ; when we recall past memories, each time the brain reconstructs the events. This explains why our past memories are so selective and biased. From what I feel, the brain does not change the normal ( = boring) moments much but amplifies certain events, good or bad. If my memory somehow turns into a 3D map, the "high" moments changes from a 5-floor apartment to Taipei 101, and the "low" moments turns from a water pool into bottomless pitfalls.
But going back to the time-flies experience of off-blogging period, I feel like the brain also has a time editing function, eliminating normal (again, boring for the brain) moments and stitching a memorable event to the next. The brain also probably creates independent threads (maps) for each events, running dozens of such threads in parallel.
So how does my brain avoids being entangled in memory thread mess when running everything in parallel? I guess one of its tricks is to add new information only when an event occurs. In that way, the brain can keep the amount of work to a modest amount. If I write a blog entry, a new event will be added to the memory thread "blog". The time in between blogging is largely ignored or used by something else (two new events for "beef noodle", three for "receiving telemarketing calls and answering I-am-a-foreigner killer code", and so on).
* The above notes are completely based on my subjective thinking.