Apple seems to be updating this page in its Supplier Responsibility section monthly (the section quoted below is toward the bottom of the page):
In our effort to end the industry practice of excessive overtime,
we’re working closely with our suppliers to manage employee
working hours. Weekly data collected in January 2012 on more than
500,000 workers employed by our suppliers showed 84 percent
compliance with the 60-hour work week specified in our code. In
February 2012, compliance with the 60-hour work week among 500,000
workers at those suppliers increased to 89 percent, with workers
averaging 48 hours per week. That’s a substantial improvement over
previous results, but we can do better. We will continue to share
our progress by reporting this data on a monthly basis.
48-hour average workweek and a five-percent month-over-month decrease in 60+ hour weeks — for February, the month where Apple was ramping up production of the new iPad (3).