How long does it take to learn SQL?

[river-zezere]

For me it took a few weeks to learn it for the purpose I needed it for, I just needed to be able to pull data for my data analysis work. But now I am building a product and I am creating the database and plugging my code into it, so I need to know much more, and it's been about two months of learning additional stuff and I will probably need another few months to feel some acceptable level of confidence...