D&D 5E - Incubation time for dragon egg?

http://archive.wizards.com/default.asp?x=dnd/ex/20031107a

Table 1-1: Dragon Egg Characteristics

Color ... Total Incubation Size
Black ...480 days Tiny
Blue ... 600 days Small
Brass ... 480 days Tiny
Bronze ...600 days Small
Copper ...540 days Tiny
Gold ... 720 days Medium
Green ... 480 days Small
Red ... 660 days Medium
Silver ... 660 days Small
White ... 420 days Tiny

ncG1vNJzZmivp6x7prrWqKmlnF6kv6h706GpnpmUqHyqusKumZqsmaS7bsDIppxmnp%2BneqW%2BwKCmp2WVnLRvgJZsbHBqXw%3D%3D