You are skilled at the art of casting spells, identifying magic items, crafting magic items, and identifying spells as they are being cast.
Spellcraft is used whenever your knowledge and skill of the technical art of casting a spell or crafting a magic item comes into question. This skill is also used to identify the properties of magic items in your possession through the use of spells such as detect magic and identify. The DC of this check varies depending upon the task at hand.
Identifying a spell as it is being cast requires no action, but you must be able to clearly see the spell as it is being cast, and this incurs the same penalties as a Perception skill check due to distance, poor conditions, and other factors.
Learning a spell from a spellbook takes 1 hour per level of the spell (0-level spells take 30 minutes).
Preparing a spell from a borrowed spellbook does not add any time to your spell preparation.
Making a Spellcraft check to craft a magic item is made as part of the creation process.
Attempting to ascertain the properties of a magic item takes 3 rounds per item to be identified and you must be able to thoroughly examine the object.
You cannot retry checks made to identify a spell.
If you fail to learn a spell from a spellbook or scroll, you must wait at least 1 week before you can try again.
If you fail to prepare a spell from a borrowed spellbook, you cannot try again until the next day.
When using detect magic or identify to learn the properties of magic items, you can only attempt to ascertain the properties of an individual item once per day. Additional attempts reveal the same results.