I think the music video needs to generate 25 to 30 million US views by Sunday to topple "Blurred Lines" from Billboard Top 100. So it'll be a battle of 1D's US Youtube streaming vs Blurred Lines' monster radio airplay.
from Vevo's official twitter: First count is 10.9 MILLION which means...@OneDirection has BROKEN THE 24HR RECORD! HUGE! Final count coming later today! #BSEVEVORECORD RT