The only path

hello
Does anyone know why the function reduce like following returns all the path between two noeds, not the only path with the shortest time?

match (a:station {name:"Mermoz"}),(b:station{name:"Brombach"}),
p=((a)-[*..10]->(b))
with p,reduce(s=0,r in relationships(p) |s+r.duree)AS temps
return p ORDER by temps ASC LIMIT 1

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