We do, yes. The main one being developers will often have to make a judgement call regarding only doing partial builds and/or coverage so that the commit is no

We do, yes. The main one being developers will often have to make a judgement call regarding only doing partial builds and/or coverage so that the commit is not always certain to work during CI (despite what they pwomise to do regarding pre-commit testing). It also means that they have a chunk of mental load that lingers after the commit, the bot might DING them and they'll need to switch back. I don't think the distinction between 10 and 40 minutes is as much as the 40 to 2.5 hours difference -- any problem worth solving is going to take you half and hour IMHO (but let's not bike-shed that), but 2.5 hours you can start a whole investigation from scratch etc...