Wave Design Vector Edit or Create

I have the attached vector file and I need it making longer at the same height, without distorting the wave.

Length needs to be 6000mm, however I understand that Illustrator doesn't go to that length. So ideally would need sections adding to the current wave that I can ad onto the end.

Need this completing by 1pm today if possible.

Will also need to see a quick mockup of the design before accepting any proposal, so I can make you you understand what I need.

Any questions let me know.