These language categorizations are famous and have been around since the 50's - not sure what the colored map really adds. When looking at the suggested number of hours, keep in mind that these measurements are for:

* a Foreign Service Officer (read: elite, meritocratically-selected diplomat, usually with a background in humanities, who is probably in command of another foreign language already).

* 5 hours/day of continuous study, with classroom instruction at the FSI's internal language school (which is considered the gold standard in language education). Don't expect the same results from self-study with a textbook and some subtitled movies.

* Reaching a B2-C1 level of proficiency. That's certainly conversational, but far from fluent. Consider that for Russian, the passive vocabulary of someone with a C2 proficiency is about twice that of someone with a C1.

I would never want to discourage someone from learning a foreign language, but the notion that one could reach professional proficiency in French within ~6 months is unrealistic for 99% of learners. Even if you lived there and devoted your entire days to study, it would be difficult to ramp up that quickly.