Yep, about 40 feet to wrap around an 8 foot pole.
You can cover it with something else first, if you like, but it will still take about 40 feet to wrap around an 8 foot pole, no matter how you think about it.
It sounds like alot, but one and a half bunches of Italian Ruscus can easily turn into a garland of that lenght, if you cut each stem into 5 or 6 peices, and then wire it into a garland.
So, all you need is 1 1/2 bunches of italian ruscus per pole, wired into a garland, then wrap it around each pole.
It will look great.
JP