From the prompting of the OP.
I went and took a head on pic of my truck with the tow mirrors NOT extended. And I measured to see how much they stick out.
The stick out, from the truck, about 14.5".
On my way back into the building, I passed several 04-08 F150s with stock non-tow mirrors. SO I measured one. The stock non-tow mirrors hang out about 11".