It depends on you. How good are you at memorizing words and patterns?

Depends everyone learns at different speeds, there's no real specific amount of time it takes to learn a language, everyone learns at different speeds. But being that you can speak English and Spanish like I can it probably won't take you long to learn French as it's close to both English and Spanish, but give it try and see how long it takes you. Also are you trying to become fluent in French or are yo just trying to learn a little French? learning a little French might take shorter time than becoming fluent in French but there's no real answer to that.