The O'Hare website claims that the MCT is 40 minutes.

My wife has a transfer from a BA flight to a United domestic next year: Covid permitting. The BA flight is scheduled tol arrive at 1845L with the departure at 2105L, so 2 hrs 20 mins.

When we last transitted, that time through EWR, we had 2hrs 42 mins to transfer, assuming everything was on schedule, but that was United to United.

Even so we still had time enough to visit the Polaris lounge at EWR.

My wife holds a US visa.

In your experience is 2:20 sufficent time? She is travelling in F with carry on only.