From /opt/rtcds/userapps/release/sys/h1/scripts/VerbalAlarms/Lock_Summary.py.

End of Day Summary 
Current Status: Observing, Locked since Dec 3 14:49:59 UTC (1164811816.0) 
Total Day Locked: 33hr 10min 4sec [138.2%] (119404/86400)
Total Day Science: error [error%] (error/86400)