Thomas Trutschel/Getty Images This story is available exclusively to Insider subscribers. Become an Insider and start reading now. Some ad agency employees say some clients have been demanding faster responses and shorter turnaround in the pandemic. Some reported working up to 75 hours a week to keep up, and others have quit, citing burnout. But fear of layoffs and losing clients has made it hard for employees and agencies to push back. Ad agency Gut Miami, which creates ads for Netflix , Coca-Cola, and AB InBev, recently announced its creative department staff couldn't take vacation the month before the deadline to submit campaigns for the industry's biggest awards show, Cannes Lions. A similar vacation ban applied to all staff the week before Christmas.