After asking about Mirror Image around town, I decided to allow the images to stack. This means that the old images will stay if a new Mirror Image spell is cast.
Now...the duration. I searched online and found a 2nd Edition description of this spell.
MIRROR IMAGE
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( Illusion Phantasm )
Level: 2
Range: 0 Components: V,S
Casting Time: 2
Duration: 3 rds./level
Area of Effect: 6-ft. radius
Saving Throw: None
Frequency: Common
Author: TSR
Book: 2
Page: 571
Description: When a mirror image spell is invoked, the spellcaster causes from two to eight exact duplicates of himself to come into being around him. These images do exactly what the wizard does. Since the spell causes a blurring and slight distortion when it is cast, it is impossible for opponents to be certain which are the illusions and which is the actual wizard. When an image is struck by a melee or missile attack, magical or otherwise, it disappears, but any other existing images remain intact until struck. The images seem to shift from round to round, so that if the actual wizard is struck during one round, he cannot be picked out from among his images the next. To determine the number of images that appear, roll 1d4 and add 1 for every three levels of experience the wizard has achieved, to a maximum of eight images. At the end of the spell duration, all surviving images wink out.
NOTES: Common spell (PHB).
This says maximum of 8, but I think 1st Ed. allowed more, so ignore the cap requirement in this description as we will be using what Cyril and I have already approved.
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