Meaning of 'a little time for the irony to strike home'

[All Potted Out]

Dear Teachers,

I read this from Reaching Out In Love: Stories Told by Mother Teresa:

"...the commercials were all about 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’s own 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?

[Sudershan]

Hey All potted out,

I think the statement "It took a little time for the irony to strike home" means it took a while to understand the contrast or deliberate contrast in the scenario... teachers please confirm the same :!:

Luv,
Sudershan