I see your 2+ hours and I raise you 1/2 of a server year of test regressions for every commit to the main trunk, beginning with a 2 hour wallclock-time build of

I see your 2+ hours and I raise you 1/2 of a server year of test regressions for every commit to the main trunk, beginning with a 2 hour wallclock-time build of all the models needed for running CPU simulations. Total wall-clock time for edits to hit the trunk is 2.5 days.