SharePoint online search and managed properties created at site collection level

I am creating the managed properties for the list columns at site collection level in SharePoint online and setting the Searchable, Queryable, Retrievable to checked and also mapping to crawled property. I wanted to check couple of things

  1. What is the time period for the the full crawl and the time period for the incremental crawl in SharePoint online
  2. Will I get the managed properties (column for which the properties are created) values in the search result like we get for Title, Author etc. with Site collection level managed properties or I need to create managed properties at Tenant level to get the column results in the Search results.