To my surprise, the build master is now estimating the time till the current build completes, and it is updating throughout the build too. Unfortunately it gives the time as the time zone PDT, thus you have to do some awkward calculation it get it to your local time zone.
When building the CWSs, it is taking about 7 hours to do a complete build and upload of the install set. This is a bit of a speed up over the 8 or nine hours to do everything except the upload of the install set. Therefore it is a good idea to have ccache installed if you are recompiling the same large project repeatedly.