New ‘People’ Cover: Blake Shelton & Miranda Lambert ‘Kill Each Other’ If They Spend Too Much Time Together! 2

What’s the secret to Blake Shelton and Miranda Lambert‘s 18-month marriage?

“We won’t go more than two weeks without seeing each other,” Miranda tells People, in its new cover story.

But The Voice‘s Blake cautions if they spend too much time together, “we’ll kill each other!”

For more on Blake and Miranda, pick up the new issue of People on newsstands Friday.