Please refer to this link http://www.cic.gc.ca/english/helpcentre/answer.asp?q=855&t=6. It says the following.assilent said:I am not able to get a proper answer anywhere . I have made a profile on CIC. I have provided all the accurate information and questionnaire said you are eligible for express entry and gave me points as well.
To be considered under the Canadian Experience Class:
"You cannot count work experience you gained while enrolled as a full-time student. Your work experience must have been gained while on a valid work permit, such as the Post-Graduation Work Permit.
You must have gained the equivalent amount of experience as someone who worked full-time for at least one year (1,560 hours) in the three years before you submit your Express Entry profile."