I had a blue screen of death failure on my Windows PC.
After restarting the PC two OET workunits remembered the elapsed time but lost the CPU time from before the failure and started from the beginning of the workunit.
In other words workunit did not restart from the latest checkpoint.
An extract from the stderr file.

Result Name: OET1_ 0000064_ xSDGP_ 0989_ 1--
<core_client_version>7.2.42</core_client_version>
<![CDATA[
<stderr_txt>
INFO: No state to restore. Start from the beginning.
[17:11:51] Number of tasks = 84
[17:11:51] Starting task 0,CPU time is 0.000000.
[17:11:51] ./ZINC17022860.pdbqt size = 32 8 ../../projects/www.worldcommunitygrid.org/oet1.xSDGP.pdbqt size = 2493 0
[17:15:52] Vina exited normal 0.
[17:15:52] Finished task #0 cpu time used 237.137120
[17:15:52] Starting task 1,CPU time is 237.137120.
.
.
.
[18:05:46] Finished task #32 cpu time used 123.802394
[18:05:46] Starting task 33,CPU time is 3185.524820.
[18:05:46] ./ZINC17022966.pdbqt size = 25 6 ../../projects/www.worldcommunitygrid.org/oet1.xSDGP.pdbqt size = 2493 0
INFO: No state to restore. Start from the beginning.
[18:12:02] Number of tasks = 84
[18:12:02] Starting task 0,CPU time is 0.000000.
[18:12:02] ./ZINC17022860.pdbqt size = 32 8 ../../projects/www.worldcommunitygrid.org/oet1.xSDGP.pdbqt size = 2493 0
[18:16:14] Vina exited normal 0.
[18:16:14] Finished task #0 cpu time used 238.416328
[18:16:14] Starting task 1,CPU time is 238.416328.
.
.
.
[20:27:52] Vina exited normal 0.
[20:27:52] Finished task #83 cpu time used 77.236095
20:27:52 (1956): called boinc_finish

</stderr_txt>
]]>