I remember it happened to me on a Saturday morning, around ten. I was at home, alone, so I can't provide observations of others. At the time I was quietly working with one of my computers, in my usual working spot at home, in the attic. In both cases described here, I remember having been agitated about something shortly before, the first time about something at home, the second time about something at work.
I have only a very fragmentary recollection of what happened to me the first time. That first time realisation only came slowly to me (meant relatively: more slowly than at the second occasion) something was wrong. The main thing I remember (?) was wandering aimlessly around the house, and not knowing when I entered my study or the kitchen what I wanted to do there. The 'event' lasted for a few hours, I seem to remember about three although I can't point out a specific moment it began or ended.
I do remember the feeling of being lucid and having a very clear mind. I was able (or thought I was able can't really decide that) to recognise having lost my sense of time. I found (even during the 'event') I could see a difference with my father, when I witnessed him having a TIA. He kept asking what date it was, without giving any indication he knew what was happening to him. I, on the contrary, found myself very lucid and believed to have a good view of what was happening to me. Whether that was a correct deduction remains to be seen, especially if we look at the observations of some others related to the second time this happened to me.
The second time, the 9th of January 2009, I immediately recognised what was happening to me. (It was recognition of the symptoms as well as a recollection of the previous occurrence). I was a Friday. Again I was quietly at work (no special circumstances), in my office. Since I have my own room I'm not under continuous observation by others.
Also again I felt I was very lucid, especially at the start. At the same time I seemed to realise I wasn't so lucid after all.
I "remember" trying to analyse whether there was more wrong with my memory. Doing that I recalled we had had a farewell party for one of our headmasters the day before. Now I couldn't remember the names of his three children I had met for the first time at that occasion. (Later, after the 'event', I was able to recall their names). I now did realise I was 54 years of age, so we had to be at the end of 2008 or the beginning of 2009 (my date of birth is November 6, 1954). I also remember seeing the actual date on the screen left no impression: it didn't help me to regain my sense of time: it was a more or less abstract fact (usually I get a mental image with a certain time or date). I also noticed I completely forgot the date I had just read, the moment I turned away from the screen.
Not being of a clear mind: I did realise something was wrong. When one of our fellow workers, with whom I have to be rather cautious, entered my office for an appointment, I told him I had some minor problems with my memory and asked to postpone our meeting. This we did and he left.
I did have a meeting with another co-worker, with whom I have an easier contact. A week after the incident he told me that the next Monday I had repeated the whole conversation we had on that Friday. I now do remember we had a conversation the Friday of the incident but I still cannot remember what we discussed.
Regarding your question about others observing my behaviour I asked my colleague who happened to come into my office at the time of the occurrence. He told me I had repeated several times the (written above) story of my lost sense of time.
As far as I recall the event lasted about twenty minutes. During the event I remembered being told after the first occurrence I didn't need to worry about it as it was nothing serious. Therefore I was less worried than the first time and tried to actively recognise and analyse what was happening to me. One can well place question marks at the values of my observations if one takes into account the observations of others. If my own observations don't even cover my actual behaviour at the time, what then is the value of what I now remember having observed at the time of the occurrence?