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A couple hundred in gulley's, inspection chambers and a few meters of pipe. I probably used a few bags of shingle too to sit the gulleys in.
If you plan the whole lot it'll be much easier, also just allow for strange smells (if you're connecting up to mains) and to be without toilet facilities until you're finished!
If you're happy too it might be worth replacing the external drains. Recently did mine and although it's hard work I hopefully won't have to worry about it for a long time, if at all. Plus I've added a few more gulley's so should shit get clogged (ha!) I can easily rod them.