Why do you think it's only "a day." Also, you are forever introducing a dependency in your build chain, codebase, and executable. EVERY 3rd party dependency should be audited as such (performance, security, usability, etc). Boost is no exception, but for the amount of things it comes with (often), and the strain on the compiler requirements it produces, it is typically included as a last resort.

I should mention, people who talk without much context are a curious bunch too.