Dragons with hatching times listed as longer than 24:00:00 will be displayed differently in the game. The Gems to rush the hatching will give the correct number of hours in the Facebook App version. The time displayed in the Facebook App will be -1 hours for any time over 24 hours because the minutes and seconds are not displayed. Dragon City on iOS will accurately display minutes and and seconds. I have chosen to display number of hours, so that it can be easily compared to the number of Gems needed to rush. That remains consistent on both platforms.