Imagine if One Day was set in Long Eaton. Now, take its sweeping, time-spanning love story, but make it platonic, and about two theatre-obsessed best mates. That’s the foundation for Jane Upton’s luminous, heart-exploding play, which catches Jess and Billy in a series of snapshots across their friendship.

Beginning in the early 90s, during their school days, and then moving through their 20s, 30s and into their mid-40s, the play threads together teenage crushes, career decisions, breakups, marriages, births and children. Jess (Katie Redford) is an oversharer while Billy (Benedict Salter) has secrets. Their early years together pass through play rehearsals, parties, personal revelations and betrayals, but even in their lowest moments, the two are always pulled back to each other’s side.

As their lives move in different directions, with Billy heading to London for drama school and later building a career as a high-flying agent, and Jess staying at home in a “suburban bubble” before eventually tiptoeing her way back into the creative scene as a playwright, they turn their noses up at the other’s choices. Still, in times of turmoil, they can’t help but pick up the phone or race across the country just to be there for their old friend. Their dialogue accurately captures people who know each other’s lives inside out. When their conversation tips into cruelty, I am a mess.

Directed by Hannah Stone, the production shows friendship as something defining. Redford and Salter make their characters people we want to stay with across the decades. In fact, time here slips through our fingers. One moment they’re 15 in 1995, and Jess is getting advice from More! magazine; the next it is 2022, and a 42-year-old Billy is considering surrogacy for his next child. Abby Clarke’s design evokes nostalgia, with the back wall composed of white, Polaroid-inspired squares that shift from photographic outlines to mirrors. The setup screams: how does it all go so fast?

With so much life to fit into 95 minutes, there are inevitable gaps in Billy and Jess’s stories. We could learn more about the structure of their families and the other relationships in their lives. But really, this is a play about the complicated, beautiful bond between two people. It leaves you desperate for more days with them.