It actually took a moment for Ariadne to register the question, because, well, they'd decided not to tell Cobb yet.

She could feel her face go red and she glanced around to collect her thoughts. Arthur had told Cobb without consulting her. He'd taken the choice from her and dumped it in her lap with no preparation!

"Yeah," she finally said, looking at Cobb again. "For a couple months, off and on."