As the peak season for the nation’s accounting firms begins, David Leeds’s team at Ernst & Young is once again bracing for two months of 60-hour weeks auditing the books of a major bank in Atlanta.

In years past, those grueling weeks often fueled nasty marital spats about missed dinners and children’s tantrums over forgotten basketball games.

Not any more. At Ernst & Young, as at the nation’s other major accounting firms, workplace flexibility has been built into the culture — even during crunch time.

Every Monday morning, the 15 people on Mr. Leeds’s team meet and lay out the personal commitments that might interfere with work — basketball games, teacher conferences, Pilates classes, weddings. They arrange to cover for each other, helping make the busy season tolerable for everyone. Despite the auditing team’s six-day weeks, one Auburn University graduate, for example, is taking next Monday and Tuesday off to see the school’s football team play in the national championship bowl in Arizona. And Mr. Leeds plans to escape to New Orleans for three days to see his daughter run a marathon.