Make sure you allow for a *tightly* furled sail when you are figuring the line length. If you measure it to give you a few wraps when furling it at the dock
in light wind
, when you eventually try to furl at sea in heavy wind
you will probably run out of line before the sail is completely furled. I would add at least several feet to what you think you will need, then trim it later if you need to. Better too long than too short.
Also, give yourself enough line to be able to start furling from the far side of the cockpit
. Sometimes, especially when shorthanded, it's more convenient to work from the other side of the boat.