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So I have a question about Oracles that I cannot seem to find an answer for. Within the Flame Mystery the text reads:

Heat Aura (Su): As a swift action, you can cause waves of heat to radiate from your body. This heat deals 1d4 points of fire damage per two oracle levels (minimum 1d4) to all creatures within 10 feet. A Reflex save halves the damage. In addition, your form wavers and blurs, granting you 20% concealment until your next turn. You can use this ability once per day, plus one additional time per day at 5th level and every five levels thereafter.

My question is how long does this ability last per use? And where can I find that information myself?

So when creating a Race in Pathfinder in the Ability Score Modifier Quality section you have the following Options:

Advanced (4 RP)

Flexible (2 RP)

Greater Paragon (2 RP)

Greater Weakness (–3 RP)

Human Heritage (0 RP)

Mixed Weakness (–2 RP)

Paragon (1 RP)

Specialized (1 RP)

Standard (0 RP)

Weakness (–1 RP)

Now my question is as follows:
A Friend of mine thinks that you can't have two Modifiers that affect the same ability score but I have read nothing that states that or otherwise. I am curious because I am creating a race and I want to give them both:
Flexible (2 RP)

Modifiers: Members of this race gain a +2 bonus to any two ability scores.

And

Weakness (–1 RP)

Modifiers: Members of this race gain a +2 bonus to one physical ability score, a +2 bonus to one mental ability score, and a –4 penalty to any other ability score.

I also want to give them the Ability Score Racial Trait:

Advanced Constitution (4 RP)

Members of this race receive a +2 racial bonus to Constitution.

So in all I want to give them the Stats:

Weakness (+2 Dex, +2 Chr, -4 Con) (-1RP)

Flexible(+2 Str, +2 Con) (2RP)

Advanced Constitution (+2 Con) (4RP)

Base Speed: Fast (1RP)

Natural Armor: +1 Natural Armor bonus to AC (2RP)

Improved Natural Armor: Additional +1 Natural Armor bonus to AC (1RP)

For a total of (9RP)

And a final stat modifier of (+2 Dex, +2 Chr, +2 Str)

So to simplify my friend says I can't use Flexible and Adv. Con to cancel out the -4 Con from Weakness. I don't see why this should be a problem since I am using RP to buy these and I am staying within the RP limit.