It is the spell's original casting time, as clarified (or rather, superseded) by rules compendium.
Whether you can get the scroll out in time however, is another matter altogether...![]()
Nope it is a standard action regardless of the spell's original casting time.
Spell Compendium specifically addresses swift/immediate action spells on scrolls.
IIRC the rules compendium is consistent with that ruling.
In essence a swift action scroll is pretty much useless - it still takes a standard action to use.
Edit:
The Rules Compendium does state it is the casting time of the spell but the Spell Compendium has a specific paragraph talking about swift and immediate action spells and activating items containing those spells.
"Activating a spell trigger item, or drinking a potion is a standard action even if the spell from which the scroll, potion, or item is made can be cast as a swift action."
A tad more specific then the rules compendium which, IMO, missed this part and was specifically written to address those 1 round casting time spells.
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