Google Replaced unitText Property with the Duration Property in Occupation Structured Data
https://developers.google.comOccupation structured data allows salary estimate providers to define salary ranges and region-based salary averages for job types. Occupation structured data can appear in the job experience on Google Search and as a salary estimate rich result for a given occupation. Google has replaced the unitText property with the duration property. While they continue to support unitText, they require duration moving forward. Google recommends that you switch over to using duration.
