1 metre is a heck of a depth for a fascia!. Did you mean the 'soffit', which is the bit underneath the fascia that returns to the wall? If so, some soffits are smooth and dead easy to clean - others are ribbed or tongue and grooved and take longer.
I've seen people on here quote anything from £1.00 t0 £5.00 per metre. I suppose it depends how awkward it is and how high it is.