How much free disk space do I need?

The project recommends about twice the game size plus 10 GB free on the Mac that builds it. Enter the size of your game.

Where this comes from and how to save space

The README gives the disk requirement as about twice the game's size plus 10 GB, and says the first build takes 30 to 60 minutes. The number is a recommendation, not a measured limit.

--work-dir puts the build folder (extracted files, shader cache, temporary files) on another drive.
--no-keep-extracted deletes the extracted files after the IPA is built, but then a second build starts from scratch and --romfs separate cannot be used.

Big games: install them with --romfs separate.