Muscovy ducks- hard to hatch?

[bordergurl]

My son as a surprise arranged to get 10 fertilized Muscovy duck eggs which will be available in about 10 days. I guess the incubator sitting empty for the last 4 days was driving him crazy! Do they really take approximately 35 days to hatch? What is the expected hatch rate on them? I have a Brinsea.

I currently have Khaki Campbell ducks who I let onto the pond today after being penned for the last 3.5 months. Will Muscovy's mix ok with them?

Any advice on Muscovy's appreciated!

Thanks