How long is the opponent intimidated?

[Keldin]

Okay, first, quotations of the relevant text(s):

"With sufficient ranks in Intimidate, you earn the following. An asterisk (*) indicates the total duration cannot exceed 1 round plus 1 round for every 5 by which you exceed the DC.

5 Ranks: If you exceed the DC to demoralize a target by at least 10, it is frightened for 1 round and shaken thereafter.*"
--- Skill Unlocks: Intimidate, Pathfinder Unchained 85

"Enforcer (Combat)
You are skilled at causing fear in those you brutalize.
Prerequisite: Intimidate 1 rank.
Benefit: Whenever you deal nonlethal damage with a melee weapon, you can make an Intimidate check to demoralize your target as a free action. If you are successful, the target is shaken for a number of rounds equal to the damage dealt. If your attack was a critical hit, your target is frightened for 1 round with a successful Intimidate check, as well as being shaken for a number of rounds equal to the damage dealt."
-- Feats section, Advanced Player's Guide 159

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My character, who, for obvious reasons, has an intimidate build, routinely... well, okay, let's just use averages. On a successful hit with his primary weapon, he does 10 points of non-lethal damage (plus another 7 if he can sneak attack, which he often does). An average on his normal Intimidate (i.e. without taking a Gravelly Tonic) is 31. This routinely beats the standard intimidate DC of a person by 15 or more, which would trigger the Intimidate Rogue's Edge.

Presuming a failure on the opponent's Will save, how long is the opponent frightened/shaken for? Is it four rounds (1 + 1 for every 5 above the intimidate DC), or ten or more rounds?

I've been reading the intimidate rogue's edge as meaning that for all other things being equal, it works just like intimidate normally would -- that the opponent would be frightened for the first round and shaken for the "rest". But the question here is what the 'rest' is.

Truthfully, it's a somewhat moot point -- because most combats don't LAST five or more rounds for an individual enemy -- but I'd like to know if I'm doing it right. I guess it's more a question of what has priority - a skill sub-ability, a feat, or a class ability (he also has the Frightening ability - I just didn't include it because it doesn't really contribute anything here.)

[*Thelith]

Whichever is best applies. With unchained unlock he would be shaken until combat ends. With enforcer 10 rounds. With neither maybe 3 rounds. So if they are shaken until combat ends you have been doing it correctly.

[toastedamphibian]

You failed to read the asterisk for the unlock Thelith.

Id say the intention was probably to have the frightened time supersede the shaken, not precede it. But that is not what it says. What it says is that it caps the duration. So, yeah, using the unlock to make them frightened reduces the shaken duration from "damage dealt" to "1+(check-dc)/5".

Equipment trick (cloak) is better. 1+1d4 rounds of frightened? Don't mind if I do.