When do CRA update?

[peme6040]

Recently I got news that some old Late's were not being reported on my CR.  I'm wondering if there is a certain date each month that each of the CRA's update their information.  I'm just curious to see how the deletion of these lates are going to affect my score.

[gdale6]

Updates occur 24/7 when a creditor reports info to one of them.

[takeshi74]

CRA's don't poll for updates.  Creditors update the CRA's.  As such, CRA's are updated as creditors report to them.