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Which version did you use since this is not 1.19.2 code?

There are a lot of changes in the vanilla and Forge code, if you have code from a older version you can throw it away. What did you already create and where did you need help? And for me, if you're talking about Gui's do you mean a Contains with Slots for Items or only a Screen (client side only) with Buttons etc.?

That is unknowable. It depends upon how many and what mods you have installed. If you use prebuilt modpacks they will often have a recommended amount.

Still don't know. 3 lines of debug doesn't give any context. Maybe your ide is holding some locks on a competing process, either within gradle or on the filesystem? e.g. when you first load into the ide it can take some time (though not 20 minutes) for it to check the gradle build is up-to-date which might be competing Try closing your ide and running the task from the command line. There is also a tool within intellij that lets you run gradle tasks. You could also try closing everything down and then checking task manager to see if you have any java background processes still running. Maybe you have a previous build that has got stuck and hasn't ended properly - so it is still holding locks? These aren't really forge issues (except that you are trying to run a forge gradle task). You would probably get more useful help asking on the forums/discord for gradle or intellij.

No idea - pun intended 🙂 Try running .\gradlew --debug genIntellijRuns so you can see what it is doing. NOTE: the debug output may contain sensitive information so don't just post it here without checking what it contains