Paco said:
Only every monday & tuesday morning.
I think it depends on your login in - We use this one:
http://services3.cic.gc.ca/ecas/ECAS.jsp
The Client Application Status site is updated weekly, usually on Tuesdays.
and under FAQs
http://services3.cic.gc.ca/ecas/redir.do?redir=faq_ecas&lang=en&app=ecas#Q14
Q14: How often is the information on the Client Application Status service updated?
A14: CAS is updated on a weekly basis. Please consult the Application Processing Times for information on how long it will take to process your application.