By building holistic, multi-dimensional personas, you can create larger aperture understanding of the user and the context of how your product or service fits into their lives.
The process of creating a persona is quite simple and quick.
That’s all it takes to create a persona, which almost operates like a “project”. Typically you’ll only ever need a handful of personas you’ll want to keep up-to-date on a regular basis.
If you're looking for a primer on what the heck a persona even is in the first place, then read this.