From the article: "They measured how long it takes for a photon to cross a hydrogen molecule: about 247 zeptoseconds for the average bond length of the molecule. This is the shortest timespan that has been successfully measured to date."
Incredible.
Where the mind truly starts to boggle is remembering that a zeptosecond still falls incredibly short of the Planck time/distance at 5×10−44.
It's certainly exciting to speculate how much closer to an actual Planck /measurement/ we may yet achieve.