The lightest is 2 seconds and the darkest is 14. I pick the perfect one which is around 10. Once I find the right exposure, I determine what colours I would like.
You can control how much cyan, magenta and yellow is in the image. I can see the image from the exposure test has slightly too much magenta so I take this out of the enlarger. From here, I pre expose the paper by 2 seconds under a different enlarger which pre-flashes it with a predetermined colour, here I flash it with a slight orange hue to emphasise the sunset effect.