[informal , emphasis]
If you say
that someone can do something until the cows come home
, but it will have no effect, you are emphasizing
that it will have no effect even
if they do it for a very long time.
You can initiate policies until the cows come home, but unless they're monitored at
a senior level, you won't get results.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers