Once you have deciphered the scroll (via a spellcraft check or a read magic spell), it takes exactly as long to activate the spell on the scroll as it would to cast it normally. (DMG, in the first paragraph of the "Activating Magic Items" section.) By default this is a standard action, because most spells are a standard action to cast, but a scroll of Identify still takes 8 hours to activate.
Here's the relevent text from the SRD:
It may take you a minute per page to read it when you first decipher it, but it very obviously doesn't take that long after you have deciphered it.
Scrolls are "Spell Completion" items. You activate them by completing the spell. Most of the work has already been done, and the magic is infused in the scroll, just waiting the last few syllables to release it. That is why it make take a minute or more to decipher it, but once you have read the scroll, you just need a few moments to find the incomplete portion of the spell, and then complete it and release the spell.
Normall spellcasting is much the same, except instead of storing the nearly complete spell energy in the scroll, you store it within yourself.
Here's the relevent text from the SRD:
Activating a magic item is a standard action unless the item indicates otherwise. However, the casting time of a spell is the time required to activate the same power in an item, whether it’s a scroll, a wand, or a pair of boots, unless the item description specifically states otherwise.
It may take you a minute per page to read it when you first decipher it, but it very obviously doesn't take that long after you have deciphered it.
Scrolls are "Spell Completion" items. You activate them by completing the spell. Most of the work has already been done, and the magic is infused in the scroll, just waiting the last few syllables to release it. That is why it make take a minute or more to decipher it, but once you have read the scroll, you just need a few moments to find the incomplete portion of the spell, and then complete it and release the spell.
Normall spellcasting is much the same, except instead of storing the nearly complete spell energy in the scroll, you store it within yourself.
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