namanjain24-sudo commented on issue #25148:
URL: https://github.com/apache/datafusion/issues/25148#issuecomment-5635545580

   Correcting one figure in my comment above. I wrote that dropping the 
`vars.USE_RUNS_ON` guard "removes roughly 83% of this workflow's ASF 
consumption". 83% is the saving on the Linux minutes of a single PR run (137.2 
→ 23.4). The honest numbers are:
   
   - **80%** of one PR run's ASF minutes, counting macOS, which does not move 
to `runs-on` (141.6 → 28.6).
   - **63%** across my whole sample, which was 6 PR runs to 4 `push` and 4 
`merge_group`. That one depends on the event mix, so treat the 80% as the 
durable number and this as illustrative.
   
   The measurements themselves are unchanged: 0 of 26 jobs on `runs-on` for 
every `pull_request` run, 15 of 26 for every `push` and `merge_group` run, and 
the per-job ratios. Sorry for the loose wording.
   


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