Live Update After Bootup

Latest and fully updated NIS2012. Win XP sp3. When I bootup in the morning I would expect to see NIS do a Live Update. This does not happen for quite some time, maybe around 20 minutes after bootup. I always do a manual Update after bootup so I know everything is up to date and from that point it Live Updates itself very regularily… But why does NIS not do it automatically just after bootup? Maybe a setting I have missed.