The most recent recompilation was last night (22 May 2006).
Generally, if any changes are made that someone wants, the source code archives will be made available very quickly, and the binaries rebuilt that night (it takes 6 hours to compile the entire set of binaries that we currently maintain).
Letting us know that you want binaries rebuilt is usually enough, since it is all done with a single simple-to-run script. Usually, this script will be fired off just before I go home at night, so that the computers have something to do in the evening besides generate plans for our eventual sadistic galactic domination.