Words with 'due' at the start and 'c' at the end

What is the total number of words one can make using words that start with 'due' and end with 'c'?
On this list of words that start with 'due' and end with 'c', you have 2 entries that can be selected.

What's the longest word you can construct with the combination searched for?
The word 'duellistic' has 10 characters.