I'm at a company where you start with 14 days of PTO per year, including sick time. It was a huge shock coming from college, and it's the main complaint I have about my job. It jumps up to 19 after two years.

I honestly think 20 days PTO is the bare minimum for a decent work-life balance, and even that isn't all that great. If I were changing jobs, I'd actually be willing to exchange salary for extra PTO, if the default PTO were less than 20 days.