Duration

for (let i = 0; i < 5; i++) {
    canvas.node(i).add({ pos: [(i - 2) * 50, -20] })
    canvas.node(i + 5).add({ pos: [(i - 2) * 50, 20] })
    canvas.edge([i, i + 5]).add()
}

canvas.pause(0.5)

for (let i = 0; i < 5; i++) {
    canvas.edge([i, i + 5]).duration(1 + i / 2)
        .traverse('red')
}