take a little time to strike home?

Lazarakis   Mon Jun 12, 2006 1:57 am GMT
"the commercials were allabout different varieties of packaged bread andother foods, commended to viewers as being non-fattening and nonnourishing. It took a little time for the irony to strike home, for Mother Teresa’sown constant preoccupation was to find the wherewithal to nourish the starving ..."

What does " It took a little time for the irony to strike home " mean?