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

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.