Test build for [Protea].
I think 200% Duration is good enough for [Protea].
This build has 45% energy efficiency. She may be a caster Frame, but the Zenurik School, plus an Arcane Energize and her Dispensary ability should be able to cover a major portion of her energy costs.
If you would like to have more energy efficiency, replace [Augur Reach] with [Streamline] and replace [Power Drift] with [Cunning Drift].
Strength will go a long way for a majority of her abilities, I've tried other builds and the loss of a major amount of Strength in return for a negligible amount of Duration seems to not be worth it in my opinion.
Best of luck everyone, and I hope this build can help!