Assertion: ferret | /r/CapableOf | sleep 15-20 hours per day
Facets:
value: at a time
type: TEMPORAL
Source sentences:
text: Ferrets can sleep 15-20 hours per day–usually about 4 hours at a time.
text: Ferrets sleep for about 15 to 20 hours per day, usually for about 4 hours at a time.