Two seconds.
That's how long Sam Kerr gets.
As the ball leaves the right toe of Pernille Harder, fizzing across the penalty area at the most delicious of angles, Sam Kerr has just two seconds to make the decision that could change everything.
Mary Earps, the Manchester United goalkeeper, is scrambling along the goal line: yellow arms flailing and thrashing through the air, trying to make herself as big and distracting as possible.
Two seconds. Or four steps' worth of time.
With each half-metre of grass she covers, Kerr's options grow thinner; her margin for error squeezing tight.
By the end of the first second, there is just one small space left beneath Earps's outstretched arm, and just one part of her foot Kerr can use to find it.
The ball rolls across the paint and 77,000 pairs of eyes at Wembley are transfixed by what she decides to do next: mouths agape, hearts stopped, breaths caught in their throats.
It's the 67th minute of Monday's FA Cup final, and Kerr's Chelsea team have been largely out-played by a sharper, hungrier United side.
Indeed, the Women's Super League leaders almost snatched the earliest-ever lead after winger Leah Galton pirouetted and buried the first shot of the game within the first minute, only for it to be called back for offside.
United have been all over last year's champions like a red rash, itching and swarming and suffocating. Chelsea barely glimpsed the white rectangle of the goal in the first half: Kerr, for her part, had just nine touches in the opening 45 minutes.
That was the plan, of course. United know that Kerr is just another warm body without the service from her teammates. So they cut off her central nervous system: pressing Chelsea's midfield into flatness, harassing their wingers into roundabouts and double-teaming Kerr herself as they tried to separate the head from the rest of the body.
These are the moments Sam Kerr gets these days. These are the puzzles she must solve as she climbs higher and higher in football, increasingly corralled by the best defenders in the sport.
They study her as though preparing for a test and in some ways, it's true: Kerr's quality is the new benchmark now, the new ceiling, the player against whom all else is compared.
Maya Le Tissier, United's 21-year-old centre-back, very nearly passed. But defending a player like Sam Kerr requires focus for every second. And two of them were all it took for the young England defender to lose Kerr in a blur of blue.
She had been militant up until that point, bodying Kerr about, anticipating her speed and agility, tucking her away into her back pocket for much of the first hour.
But Kerr doesn't panic. Not anymore. Years ago, maybe she would have let herself drift, wriggling out of the system, bending and stretching the structure out of frustration or boredom.
Not these days, though. Kerr no longer wastes her time or energy journeying out to find the ball as she did earlier in her career. Hers is no longer a scattergun approach to goal, firing from odd and awkward angles through a mix of hubris and hope. Since joining Chelsea, she has tightened her range, sharpening her game like a blade, the steel becoming thinner but deadlier when it matters.
And then the ball arrives, and this is where it matters.
She has been here before, in these weighty seconds. She knows how it feels to fail in them: the ball flying over the crossbar in France in 2019, the ball dribbling wide of both posts in India in 2022.
But she also knows how to succeed in them: the ball connecting off her diving head in Australia in 2013, the ball guided home thrice in America in 2017, the ball that somehow finds the back of the net in final after final after final in England since 2020.
They are all here now, all these seconds hanging in the space between Earps's arm and leg, in the shrinking time from the third to the fourth step.
She could have done the safer thing: let the ball come across her body, let it nestle in the in-step of her weaker left foot, let it be guided into the far corner.
But she doesn't. It is as though she sees the future: envisioning Earps's foot spearing outwards in the half-breath it will take for the ball to cross from one side of her body to the other. So she lengthens her stride and sticks her right leg out instead, clipping the ball with the outside of her boot, needling it into the one space Earps had left unguarded.
Two seconds, and the blade twists.
This is what Sam Kerr does now.
As she has risen up the ranks, her own room to move has reduced. She has had to find new ways, new openings, new seconds to rip apart. And when they arrive, she has learned to make them hers: to shape them like a sculptor, carving these simple measurements into moments and memories that will define her and the sport she now holds in the palm of her hand.
That's three consecutive FA Cups now, in addition to three English league titles, two League Cups, and a Community Shield with Chelsea. Not to mention every other trophy she has lifted in America and Australia before that.
But the weight of Kerr's worth is not only measured in silver.
It is in the spellbound looks of the 77,000 people poured into Wembley — the biggest-ever crowd for an English women's club match — and the rising tide of their voices whenever she touches the ball.
It is in her name hot-pressed across the shoulders of a generation of young players practising volleys and back-flips in the garden.
It is in the flutter of the flag she carries into Westminster, into the Olympics, into World Cups: an entire nation captured in a name.
All of these moments layered on top of each other to create one of the greatest figures football has ever seen.
And on Monday morning, in the deafening din of a sold-out stadium, two seconds was all she needed. Two simple, glorious seconds to remind us that Sam Kerr has already changed everything, and that we are still here, holding our breath, watching her do it.
