High Temperature Conductor in Air
The oxide should protect the material for a while- so if your conductors are thick they may last long enough. Nickel superalloys last fairly well, but they have high resistivity, which might be a problem in your application. 

If your maximum current is modest, I would suggest a superalloy-clad mineral insulated cable. For example, Hastelloy. Check the manufacturer's data for lifetime estimates. 

If you have high voltages, beware that many insulating materials become rather leaky at such temperatures.