The Wikipedia infobox lists “Rein Me In” as having a length of 5:37.
That figure appears in the song’s main infobox alongside its release date, genre and label. The track is a Sam Fender and Olivia Dean recording connected to Fender’s 2025 album People Watching, and the infobox treats 5:37 as the listed length for the song entry.
A common source of confusion is that the same Wikipedia article’s track-listing section gives several related timings of 5:39. Those include the digital single, the duet version and the solo version. It also lists a 6:53 live extended version and a 4:03 edit. Thus, 5:39 is not an invented number; it belongs to specific release versions, while 5:37 is the answer to the wording about the infobox. The question’s reference to that exact Wikipedia field makes 5:37 the canonical choice.