The other comment cited 30 seconds as an upper limit where it becomes clear that something bad is likely going on. The dynamic language tidbit is a red herring,

The other comment cited 30 seconds as an upper limit where it becomes clear that something bad is likely going on. The dynamic language tidbit is a red herring, since the compilation is from one language into a dynamic language, which does have some valid downsides but is widely accepted (including by yourself, if you’ve accepted Browserify). Moreover, the full build times are, at least in my experience with webpack starter packs for side projects and much larger webpack builds at work, only a cost you pay when deploying or setting up a dev environment for the first time. My local dev environments recompile only the parts of the codebase that they need to, and that usually happens quickly enough that it’s ready by the time I go to my browser and refresh.