Steps to repro:
1. Open the attached project and 'ProgressiveLightmappingExample' scene;
2. In the Preferences window (Edit>Preferences...) click Clean Cache button;
3. In the Lighting window (Window>Rendering>Lighting) click Generate Lighting buttton;
4. Wait for the bake to complete;
5. Observe Total Bake Time at the bottom section of the Lighting window.

Expected result:
Total Bake Time shows realistic bake time values (e.g. 0:01:20).

Actual result:
Total Bake Time shows unrealistically low values (0:00:04). See attached screenshot.
Regression introduced in Version 2021.2.0b16

Notes:
- Reproducible in Version 2022.1.0a12, 2021.2.0b16;
- Not reproducible in Version 2021.2.0b15, 2021.1.26f1;
- Reproducible on Windows and macOS (Intel-based and Apple Silicon);
- Reproducible when baking with GPU Lightmapper; not reproducible when baking with CPU Lightnmapper.