1 bleed damage per SA die per round until healed. Pretty simple. But does it stack.
IE a level 12 rogue doing 6d6 SA damage and hits an orc with both attacks while flanking. Does the orc now have bleed 6 or 12? Say the rogue hits him from flank one time next round and the orc has not healed does he now take 18 bleed per rd?
My understanding is that it stacks
Bleed damage only stacks when it says it stacks.
Bleed: A creature that is taking bleed damage takes the listed amount of damage at the beginning of its turn. Bleeding can be stopped by a DC 15 Heal check or through the application of any spell that cures hit point damage (even if the bleed is ability damage). Some bleed effects cause ability damage or even ability drain. Bleed effects do not stack with each other unless they deal different kinds of damage. When two or more bleed effects deal the same kind of damage, take the worse effect. In this case, ability drain is worse than ability damage
Bleeding Attack* (Ex): A rogue with this ability can cause living opponents to bleed by hitting them with a sneak attack. This attack causes the target to take 1 additional point of damage each round for each die of the rogue's sneak attack (e.g., 4d6 equals 4 points of bleed). Bleeding creatures take that amount of damage every round at the start of each of their turns. The bleeding can be stopped by a DC 15 Heal check or the application of any effect that heals hit point damage. Bleeding damage from this ability does not stack with itself. Bleeding damage bypasses any damage reduction the creature might possess.
It does not stack.
ahh reading is a good idea mauril.