It has everything to do with the dragon you get. If you have a 5 hour breeding time cool down, if you look for a dragon that has an incubation time of 5 hours (on this site, use the search box), you'll see what your possible outcomes are. Just gotta remember though that perks can bring that time down slightly, so you'll have to account for that.
For iOS Users
Your friends list can be opened by tapping the button above the “Store†button.
To invite friends, you need to be connected to Game Center (if you are connected, the Game Center symbol will be visible in the friends window, to the right of the “Friends†sign).
You can only invite your Game Center friends to the game.
To invite a friend, select his/her name from the list and tap the “Invite†button.
You can also invite your Facebook friends. The process to add friends is the same.
For Android Users
Your friends list can be opened from the main menu by tapping the button above the “Store†button.
To invite friends, you need to be connected to Google Game Services (if you are connected, the Google symbol will be visible in the friends window, to the right of the “Friends†sign).
You can only invite your Google friends to the game.
To invite a friend, select his/her name from the list and tap the “Invite†button.
You can also invite your Facebook friends. The process to add friends is the same.
Hey guys we have a Friends section as well! Feel free to add your name there to obtain friends :) Also in game, remember, you don't have to wait for people to add you, you can add them as well! :)