Assertion: grouse's egg | /r/HasProperty | incubated
Facets:
value: for around 21 days
type: TEMPORAL
Source sentences:
text: The eggs are incubated about 24 days, and all the eggs hatch within a few hours of each other during late May and early June.
text: She lays between 7 and 10 eggs which are then incubated for around 21 days.
text: These eggs are incubated (keeping warm) for about 30 days.