When submitting external jobs pro programatically as described in
https://hudson.dev.java.net/cron.html the duration is not stored correctly. It
shows up for a minute or so and then is reset to zero in the graph display and
the graph gets wonky.

Sample submitted job XML:
<run><log
encoding='hexBinary'>576564204d61722032382031363a30373a3035204d535420323030370a0a</log><result>0</result><duration>5000</duration></run>