How could you not understand the time saved? It says right below that don't reinvent the wheel every time you make a new app. It's pretty clearly a programming

How could you not understand the time saved? It says right below that don't reinvent the wheel every time you make a new app. It's pretty clearly a programming library to implement user login and management instead of writing your own. Time saved is clearly development time. I don't think you even read the text, just skimmed the titles, but then it certainly isn't strange you don't understand anything about the product.