Our traveler line is an old Spectra halyard, 27 feet each side, with the tail dead ended to an eye just beyond the end of the traveler. That's long enough to have the mainsheet trimmer fully hiked near the winch control it with car all the way to leeward. Too long except when you really need it. I've considered clipping the tail to the toe rail or even the lifelines but worry it might foul the spin sheets.
It is enticing to use a continuous control line but don't be surprised if you cut it later. The loop adds friction when you have to pull extra line up the leeward side and it is more likely to foul or get stepped on when you need it. If you like to handle your own traveler you might be able to go much shorter and keep the line from dangling on the cockpit floor.
