This has been the policy at every boring non-tech company I've ever worked at. You get hired with a certain amount of PTO, and that number starts to grow after some initial waiting period (e.g. 3 years). It's not uncommon for company lifers who have been there for 20+ years to have doubled or tripled the PTO they had when they started.

That being said, I've never heard of a place that _literally_ ties PTO to tenure -- if you join the company in a senior position, you can always negotiate to start with a similar amount of PTO as someone who worked their way into that position internally.

Literally nearly all of them. PTO accrual is the most common form of PTO granted; you accrue a certain number of PTO hours for every week you work, and your maximum PTO per year changes with your tenure, starting at, say, 10 days per year and maxing out at, say, 25 days per year, for example.

You can usually also roll them over to the next year up to some amount.