I've gathered some numbers (most recent commits last):
290def72f54db7969258b4541aaefc87b54ce448 44354749424 Implement warnings for Semigroups as parent of Monoid
afb721390cd506f09ce9f04aa3fb19324c2ae5a0 44354739384 MkId: Typos in comments
14d0f7f1221db758cd06a69f53803d9d0150164a 44354739384 Build system: Add stage specific SRC_HC_(WARNING_)OPTS
6dce643d1981f1ecba2b38f5932720385999244b 44354736328 Fix grammar and typo in TcTyDecls
36c1247846bbbc1af939c098660ce27ddaa36a0d 44354706024 Remove duplicated line
44c3e3768e28199468d2ffff0b25db055d22c310 44354770368 Fix warning about unused pattern variable
b432e2f39c095d8acbb0cfcc63bd08436c7a3e49 44354770368 Make the determinism tests more robust
1e041b7382b6aa329e4ad9625439f811e0f27232 44420002848 Refactor treatment of wildcards
218fdf92370021b900af1e78323764cceb7ac609 44420193216 Make the order of fixities in the iface file deterministic
741f837d652fd00671614d52a6cb16fbc3758480 44489177576 Implement more deterministic operations and document them
I've collected them on my machine and they differ from what harbormaster reports, the last commit measured by harbormaster is 44728541608.
The target value is 40624322224 +/-10% and my numbers suggest it's been steadily climbing out of that range. I don't know what this test measures exactly, does it depend on the number of haddock comments in GHC's source?
Cheers,
Bartosz