ou can do is to visit this mc-plots page:
http://mcplots-dev.cern.ch/production.php?view=runs&rev=2279&display=all

[pre]run events attempts success failure lost
.
.
.
ee zhad 200 - - sherpa 2.2.5 default 22000 129 14 14 101[/pre]

Locate your running task and check the success ratio.
In this case: 10.9%

Then decide if this is enough for you to let the task run <edit> (better) give the task a chance to finish </edit> until it hits the BOINC deadline.
I don't know if a task that is returned after the BOINC deadline counts as success in mc-plots.