Robert Downey Jr.’s wife Susan spilled a secret rule in their 18-year long marriage which they follow to keep their relationship stronger.

During her conversation with PEOPLE magazine for their latest issue, honouring Robert Downey Jr.’s first ever Oscar award for Oppenheimer, Susan revealed, “We do have a two-week rule, which often feels too long, but we don't go more than two weeks without seeing each other and the family being together.”

She continued, “You keep the basic rule of two weeks, and then you don't try and think too far ahead, because so much of what we do is oddly unpredictable. You just never know.”

Susan, who is also Downey’s producing partner at their company, Team Downey, noted, “Someone might get sick, or there might be a shutdown, or this or that. So you just have to have some basic things in place, and then you have to be willing to flow with the rest of it.”

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“Someone might get sick, or there might be a shutdown, or this or that. So you just have to have some basic things in place, and then you have to be willing to flow with the rest of it,” she told the outlet.

For the unversed, Susan and Robert Downey Jr. first met each other in 2003 while she was producing her thriller film Gothika.

They tied the knot in 2005 and share son Exton, 12, and daughter Avri, 9.

Robert Downey Jr. won his first Academy Award for Best Supporting Actor in Christopher Nolan’s hit Oppenheimer.