Assertion: guard | /r/CapableOf | stand for two 20-minute intervals
Facets:
value: during their 1-hour shifts
type: TEMPORAL
value: motionless
type: MANNER
Source sentences:
text: The Changing the Guard at the Tomb of the Unknown Soldier, in particular, has become a tourist attraction, with many people watching the guards, who stand motionless for two 20-minute intervals during their 1-hour shifts.