This happens more often than you can believe It may happen to be three days, for example by. Yes, it can happen that it happens in broad daylight, Only the strongest can be seen. It does not happen at night stars, mine I saw there, Stroke of luck that evening he had a passing. I have on my laptop software that shows the time of passage of Satellites. Everything depends on the position and sky .. A satellite is in Vendée, will not necessarily be seen at the same time in Normandy, if any. Software: ISS Detector. If not for France: http://www.astrosurf.com/astroqcvc/irridium.htm Do not confuse Iridium Flash with "ISS" (International Space Station).
For me, Monday: Iridium 61 at 06:39:49 -> magnitude -0.8
Thuesday: Iridium 52 21:10:32 ->magnitude -7.4
Etc..
For exemple Saturday i've 2 Iridium:
Iridium 5 with magnitude -3.9 at 06:18:28
and Iridium 63 with magnitude -0.9 at 23:05:24