Question about Shadow Illusion

[b4ndito]

I'm playing an illusionist and eventually becoming a shadowcraft mage, and ONE little question keeps ringing in my head:

If I use Silent Image to replicate Mage Armor, is the duration taken from Mage Armor, or is it concentration based like Silent Image? If I replicate Summon Monster, is its duration 1rd per level or is it the length I'm willing to concentrate on the image?

Please explain this to me.

[Chronos]

The ability is based on the Shadow Conjuration spell, and Shadow Conjuration uses the duration of the emulated spell. So Mage Armor would last for hours, and summoned monsters would last for rounds, with no concentration required for either.