You should easily be able to clear 200 metres a day. There will be a lot of crap comes out, so if there is nowhere on site to dump it you need to price for a skip. Its a 2 man job, 1 cleaning out and bringing it down and the other taking it off the cherry picker and dumping it. You need some decent size tubs and a spade or shovel that will fit in the gutter. Also make sure that the cherry picker will hold at least 2 men and tools.
I would price for 2 men for 3 days, and then add on cherry picker, skip, and any other extras.
Hope this helps. Regards Peter