The LSC_LOCK guardian was in WORKING_WITH_OBSERVATION_WITHOUT_LINES state from April 26 2025 10:54:47.000 (1429700105) to April 27 2025 01:49:25.000 (1429753783). But I heard from Yokozawa-san that this lock was actually the silent run. He recognized this and changed the LSC_LOCK guardian state to OBSERVATION_WITHOUT_LINES.
So, the silent run was from from April 26 2025 10:54:47.000 (1429700105) to April 27 2025 09:20:23.000 (1429780841), even though the LSC_LOCK guardian was not in OBSERVATION_WITHOUT_LINES.
The continuous lock of ~22 hours was the longest lock in the recent situation!