Talk:Game Updates/@comment-173.63.172.62-20120518013756/@comment-4610180-20120518015317

No it doesn't. It only affects breeding. Eggs leave the breeding cave/island and end up in the nursery for incubation, and the upgrades have no effect on the nursery. The 20% decrease applies only to breeding.

For example, with the upgrade, it takes two Panlong Dragons 29 hours to breed, The egg will still take 36 hours to incubate afterwards.