How do you revive a Dragon Egg?

Could you please elaborate on the process of reviving a Dragon Egg? Are there any specific steps or rituals that need to be followed? Is there a specific environment or set of conditions that the egg must be in for the process to be successful? Additionally, is there a time frame within which the egg must be revived, or can it remain dormant indefinitely? Lastly, are there any known challenges or obstacles that one might encounter when attempting to revive a Dragon Egg, and how can these be overcome?