"We won't go more than two weeks without seeing each other," says Lambert, 28, in PEOPLE's new issue.
But sometimes, not seeing each other works wonders too. If they spend too much time together, says Shelton, 36, "we'll kill each other!"
Despite their busy schedules, which Lambert has said meant they've spent only about 150 days together since they exchanged vows under an arch of antlers in her native Texas in May 2011, the couple has recently been able to hunker down in their rented home in Hollywood (where Shelton tapes The Voice).
Up next for country's fun-loving couple: Each is nominated for four CMA Awards, which will be handed out Thursday; Lambert heads into the studio to start work on a new Pistol Annies album; and Shelton celebrates his new holiday album Cheers, It's Christmas with a TV special called Blake Shelton's Not So Family Christmas, airing Dec. 3 on NBC.
Reporting by DANIELLE ANDERSON, JULIE JORDAN and MARK GRAY
For more on Shelton and Lambert's marriage secrets – including how they really feel about Hollywood vs. Oklahoma, their plans for starting a family and more – pick up this week's issue of PEOPLE, on newsstands Friday