Steps to repro:

1. Open attached project and 't1' scene;
2. In the Lighting window click 'Generate Lighting' button;
3. Wait until scene's GI is baked;
4. In the Lighting window observe the 'Total Bake Time' field.

Expected result:
The total bake time shows actual baking time.

Actual result:
The total bake time is '0:00:00'. See the attached screenshot.

Notes:
- Reproducible in 2019.1.0a1, 2018.3.0b1;
- Not reproducible in 2018.3.0a11, 2018.2.8f1;
- Reproducible on Windows 10.