flyingcab said..
An easy solution is to use a lighter to gently heat the lines.
The heat will make the plastic material in the lines shrink up to 10%.
so if you do this over a meter, you will get approx 10cm reduction in length
I would be reluctant to put heat to my lines. Heat makes plastic brittle, it might weaken the lines, make them fail prematurely, etc. Don't know for sure, but why risk it?