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As a side note: the one development that is taking our local build time from 15 minutes down to 5 minutes (yes, really), is the V2 DataBinding compiler.
See: <https://www.reddit.com/r/androiddev/comments/9nru7j/data_binding_compiler_v2_in_android_studio_321/>

DataBinding v2 compiler available at least 6 months, why didn’t try to use it before?

<@U0BRK9HC5> Two reasons:
1) We didn't know Data Binding was the cause until recently - we had done many Gradle scans and knew the time was spent Annotation Processing, but we assumed Dagger was the culprit until we enabled verbose `kapt` to discover the truth.
2) There is a bug in DataBinding v2 compiler that still prevents us from using it, and probably won't make it to production for another few months (It's working in 3.4 Canary 2 only).  See: <https://issuetracker.google.com/issues/117666264>
We actually have to explicitly disable v2 on current versions of Android tool-chain since upgrading to AS 3.2.1 broke our project due to this bug.
<@U0QKGKMKN> 15 minutes is a good day! Our project's CI takes 32 minutes.  It's painful.

Our builds take between 1 and 2 minutes on relatively fast machines and I'm already considering replacing some of our annotation processing based libs with something else because of that.

<@U0BRK9HC5> Because our project relies on a large in-house framework with a slower release cycle in which Data-bound layouts are provided, based on v1.

<@U0QKGKMKN> It's all relative isn't it? :slightly_smiling_face: I'd be doing the same in your position but right now I'd give my right arm for a 2 minute compile - it's been a slow year!