To facilitate companies submitting their CLP Notifications in time, ECHA will keep the REACH-IT system and its Helpdesk open from 27 December until 30 December 2010.

Remember that this is a European outfit, so these extended hours are an exception.

In addition, the Helpdesk will be open on 3 January 2011 until 17.00 GMT.
REACH-IT will be open until 24.00 GMT. 

REACH-IT will be open between Christmas and New Year for CLP notifications.

For more information, please see this article on REACH CLP deadlines from Actio Corporation, makers of REACHtracker software.