Originally Posted by Square-Enix
4. Progressing to 100% and Choosing Commands
Each command executed during synthesis will have an impact on the Progress, Durability, and Quality values. Achieving 100% Progress before the Durability reaches zero, and then choosing the Finish command within the allotted time will result in the successful synthesis of an item or items. Neglecting to select a command during the available time period, or using the Wait option, will cause only the Durability to decline. Should the Durability reach zero before achieving 100% Progress, the synthesis will end in failure.