When texlive is built on hydra, the build slave that built it is tied up for 12 hours or more waiting for the build outputs (over 3 gigabytes!) to be transferred back to hydra.
By design, only one transfer can happen at a time from a given build slave, so during those 12 hours, the build slave's CPU is left idle, and typically another 3 built-but-not-yet-transferred packages must wait until the texlive transfer finishes. I suggest that we arrange for hydra.gnu.org to build texlive locally for x86_64 and i686, to avoid this problem. What do you think? Mark