For CEC eligibility, you get to add up all NOC 0, A and B Canadian experience in the 3 years before you apply.
For CRS points, you get to add up all NOC 0, A and B Canadian experience in the last 10 years before you apply.
Here's a suggestion. Write down all your Canadian and Foreign work experience in the following format, and I will tell you how much work experience you already have:
First day of job, last day of job, NOC code, hours per week
Go back 10 years. If your hours per week change, put a new line with the new hours per week and the respective dates.