Looking at this a bit further over the last couple of days, it appears that the console only updates the Last Scan Time once a day, at which point it updates with every scan done in the last 24 hours and puts them in at the correct time, so in effect on my system it processes all the scan as they happen but only updates the Last Scan Time at approx. 10:00 every day, and then doesn't update any times until 10:00 the next day.
Is this normal, as I've never noticed it before, but it might just be me being unobservant?