The honest, unsatisfying answer: it depends what "learn" means to you. Here's a more useful way to think about it.
The US Foreign Service Institute estimates around 600 hours of study for an English speaker to reach professional working proficiency in French — but conversational comfort for travel or casual conversation comes much sooner, often within a few months of consistent daily practice. The honest answer is that fluency isn't a single finish line; being able to order food, follow a conversation, or read a menu are all real, separate milestones you'll hit well before "fluent."