Read this and answer the question. If the question is unanswerable, say "unanswerable".

On June 11, 2006, the British tabloid The Mail on Sunday reported that iPods are mainly manufactured by workers who earn no more than US$50 per month and work 15-hour shifts. Apple investigated the case with independent auditors and found that, while some of the plant's labour practices met Apple's Code of Conduct, others did not: employees worked over 60 hours a week for 35% of the time, and worked more than six consecutive days for 25% of the time.

What percentage of the time did The Mail on Sunday claim workers labored for at least seven straight days?
25