Standard Build Unit
A "standard build unit" ("SBU") is a term used during initial bootstrapping of the system, and represents the amount of time required to build the first package in LFS on a given computer. Its creation was prompted by the long time required to build a LFS system, and the desire of many users to know how long a source tarball will take to build ahead of time.
As of Linux From Scratch version 6.3, the first package built by the user is GNU binutils. When building it, users are encouraged to time that build process using shell constructs and dub that time that system's "standard build unit". Once this number is known, an estimate of the time required to build later packages is expressed relative to the known SBU.
Several packages built during compilation take much longer to build than binutils, including the GNU C library (rated at 9.5 SBUs). The unit is not a concrete description, and must be interpreted as an approximation; many various and unrelated factors influence the wall-clock time that a package requires to build.
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