How much disk space is needed for compiling?

Approximate disc space required for compiling OpenWrt:

Branch Min. Max.
typical, Stable 10 GB 20 GB
Development ? 15 GB
Development+feeds ? 15 GB
all feeds/pkgs x FIXME
all feeds+debug FIXME

Typical: Compile an Image that is working on typical consumer routers that have 4MB or 8MB flash.

Compiling also tested on some Windows OS under AndLinux (coLinux + Ubuntu)