LHC@home

My BOINC client reported the final elapsed time as 48984.660393 s instead the LHC website shows a value of 51,146.00 s.
I wonder where that value comes from as it is not included in the sched_request*.xml.

<result>
<name>LHCb_6744_1494175687.635083_0</name>
<final_cpu_time>87587.530000</final_cpu_time>
<final_elapsed_time>48984.660393</final_elapsed_time>
<exit_status>0</exit_status>
<state>5</state>
<platform>x86_64-pc-linux-gnu</platform>
<version_num>101</version_num>
<plan_class>vbox64</plan_class>
<final_peak_working_set_size>2435616768</final_peak_working_set_size>
<final_peak_swap_size>6859214848</final_peak_swap_size>
<final_peak_disk_usage>5104619361</final_peak_disk_usage>
<app_version_num>101</app_version_num>