Hello Lawson stone
Welcome to our community and thank you for your question!
We had a couple of similar questions here on Wefugees in the past. Please check out the following links to find information about the marriage procedure in Italy:
As you can see reading my answer from the thread linked above, I can't tell you how long the procedure will take. It probably depends mostly on how long it takes to gather and translate the required documents. Nonetheless, I hope the general information provided here will help you to get an overview of the procedure.
If anything remained unclear, feel free to ask further questions.