Since you asked for it...
Chris, buildd hosts keep those time and space usage statistics in a database, which can be queried...
Script started on Sat Jan 5 19:54:15 2008 wouter@country:~$ ssh kiivi.cyber.ee Linux kiivi 2.6.18-4-mac #1 Fri Mar 30 23:05:11 CEST 2007 m68k No mail. Last login: Sat Jan 5 20:41:16 2008 from d51532c45.access.telenet.be wouter@kiivi:~$ avg-pkg-build-time -s -t | head -n 20 boost: 2015312k (2015312k lastest) iceweasel: 1846628k (1846628k lastest) iceape: 1674172k (1674416k lastest) icedove: 1624848k (1624848k lastest) xulrunner: 1611880k (1611880k lastest) mesa: 1230432k (1230432k lastest) koffice: 1208062k (2115156k lastest) gcc-snapshot: 1191866k (1207164k lastest) gcc-4.1: 1185620k (1185620k lastest) gtk+2.0: 1148634k (1208684k lastest) k3d: 1145580k (1145580k lastest) ardour: 1077800k (1077800k lastest) lyx: 924876k (924876k lastest) gcc-4.2: 909488k (909488k lastest) gcc-3.4: 892015k (571084k lastest) glibc: 891408k (891408k lastest) linux-2.6: 725961k (744700k lastest) kdebase: 720618k (1106804k lastest) kdelibs: 716376k (1150372k lastest) kdepim: 711858k (784356k lastest) wouter@kiivi:~$ avg-pkg-build-time -t | head -n 20 gcc-snapshot: 220:52:14 (2 entries, sigma 27:38:21) axiom: 216:27:57 (1 entry, sigma 00:00:00) gcc-4.1: 193:47:30 (1 entry, sigma 00:00:00) k3d: 177:22:10 (1 entry, sigma 00:00:00) gcc-3.4: 171:40:28 (4 entries, sigma 25:10:55) boost: 141:13:38 (1 entry, sigma 00:00:00) koffice: 140:40:23 (2 entries, sigma 53:48:58) ace: 130:04:14 (1 entry, sigma 00:00:00) linux-2.6: 129:36:19 (3 entries, sigma 10:12:24) qt-x11-free: 105:00:32 (1 entry, sigma 00:00:00) xulrunner: 97:03:38 (1 entry, sigma 00:00:00) iceape: 96:23:13 (2 entries, sigma 03:12:58) kdepim: 96:06:54 (2 entries, sigma 19:09:39) icedove: 94:35:48 (1 entry, sigma 00:00:00) iceweasel: 93:56:26 (1 entry, sigma 00:00:00) gcc-4.2: 91:08:32 (1 entry, sigma 00:00:00) glibc: 91:01:58 (1 entry, sigma 00:00:00) kdevelop3: 84:27:21 (2 entries, sigma 02:47:35) kdeedu: 82:09:55 (3 entries, sigma 10:59:18) vtk: 81:44:20 (3 entries, sigma 00:46:32) wouter@kiivi:~$ logout Connection to kiivi.cyber.ee closed. wouter@country:~$ ssh arrakis Linux arrakis 2.6.12-1-amiga #1 Sat Aug 13 22:59:59 CEST 2005 m68k The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Please read "links2 http://nefud/info.txt" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ No mail. Last login: Sat Jan 5 18:48:58 2008 from hahn.os.localnet on pts/5 wouter@arrakis:~$ avg-pkg-build-time -s -t | head -n 20 wxwidgets2.6: 1648020k (1648020k lastest) qt4-x11: 1601086k (1753532k lastest) gcj-4.1: 1135772k (1135772k lastest) k3d: 1094345k (1159204k lastest) kdebase: 1087375k (1087368k lastest) python-kde3: 1018144k (1018144k lastest) ghc6: 991524k (991524k lastest) gcc-3.3: 988690k (990244k lastest) glibc: 814536k (855720k lastest) lyx: 804672k (804672k lastest) bouml: 729888k (729888k lastest) kdelibs: 685565k (1142304k lastest) freedroidrpg: 673988k (673988k lastest) mozilla: 663066k (636896k lastest) ardour: 647580k (691128k lastest) mozilla-thunderbird: 591384k (591384k lastest) omniorb4: 576288k (576288k lastest) subversion: 568764k (624768k lastest) xorg-server: 527520k (527520k lastest) mozilla-firebird: 498896k (502692k lastest) wouter@arrakis:~$ avg-pkg-build-time -t | head -n 20 enlightenment: 198842:37:14 (3 entries, sigma 344403:17:35) axiom: 164:43:54 (1 entry, sigma 00:00:00) ghc6: 159:20:15 (1 entry, sigma 00:00:00) k3d: 145:18:35 (3 entries, sigma 57:08:46) python-kde3: 126:39:34 (1 entry, sigma 00:00:00) qt4-x11: 121:26:11 (2 entries, sigma 03:07:35) gcj-4.1: 116:05:34 (1 entry, sigma 00:00:00) gcc-3.3: 108:45:19 (3 entries, sigma 02:01:50) qt-x11-free: 99:12:17 (4 entries, sigma 14:12:32) wxwindows2.4: 90:26:51 (1 entry, sigma 00:00:00) openscenegraph: 74:37:21 (1 entry, sigma 00:00:00) ardour: 63:44:55 (2 entries, sigma 07:23:05) bouml: 62:01:16 (1 entry, sigma 00:00:00) gcc-snapshot: 61:10:07 (1 entry, sigma 00:00:00) mozilla-thunderbird: 60:47:29 (1 entry, sigma 00:00:00) mico: 60:15:15 (1 entry, sigma 00:00:00) kdebase: 58:41:04 (5 entries, sigma 08:00:17) glibc: 58:04:26 (6 entries, sigma 40:01:12) mozilla-firebird: 52:47:13 (2 entries, sigma 11:31:07) zeroc-ice: 52:34:03 (2 entries, sigma 28:12:19) wouter@arrakis:~$ logout Connection to fremen-os.dyndns.org closed. wouter@country:~$ exit Script done on Sat Jan 5 22:28:46 2008
"avg-pkg-build-time" is a script that queries the statistics database. It's quite CPU-intensive, so I don't like to run it too often (certainly not from cron); but, hey, here you go.
In case you didn't know, "arrakis" and "kiivi" are both official m68k/unstable buildd hosts, and especially arrakis has been for quite a long time, although it's been reinstalled once or twice since. Oh, and yes, it does appear as though some bits of the data are invalid, but most of the idea should be alright.
(oh, and before you ask, no, it didn't take two and a half hours to run those commands -- I just needed to go while the last one was running, and had only come back several hours later)