the odd occasion BrE
the odd moment BrE
the odd day BrE

I'd find myself thinking about it at odd moments all week long.

It happens to me at odd moments in the summer.

The memory of that day would come back to me at odd moments.

So they turn up at odd moments during the narrative.

At odd moments, she felt them try to read the other's thoughts.

Please do keep me posted, when you have the odd moment.

It's an odd moment that no one knows quite what to do with.

We are at an odd moment in our political debate.

The report comes at an odd moment for industrial policy.

For an odd moment she considered the quirky nature of the human mind.