That's not a bad idea. I would rather a straight 30-60 seconds though. I don't think small percentage boosts like that would fix the problem blu has with short lasting spells. It helps though!
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Disclaimer: I'm a new-FFXI newbie and old-school vet so my opinion doesn't really matter in the 'new' FFXI, but I can say I was totally disappointed by pretty much every BLU buff except hastes and refresh because 1-1.5 min duration is too damn short to do anything with, and I've only played solo and done none of the 'real' end-game content yet. I'd be all for completely removing Diffusion in favor of making BLU buffs useful, even though I LOVE the concept of Diffusion.
Diffusion actually has a use even without being in a party, assuming you have 5/5 merits in it, and either augmented relic feet, or the ilvl variants, you can get +45% (I think) duration.
Only really useful for the likes of Battery Charge or Erratic Flutter though (assuming it even works with EF, but it worked with the other 2 haste spells), but increasing 1 of them to 7:15 duration is handy.
If a buff last 3 minutes we could become too Overpowered? Excuse me but i think there is a big mistake here. A SAM With tachi Fudo against a MOB of high level could reach damage of 10+k without using mythic or relic or empy. To reach a similar amount of damage with blu i must have Tizona with tons and tons of equip, and even in this case is still difficult.
Diffusion and duration of buff is an issue? well really easy to solve:
Animal ConcentrationDuration 1m or till next buff spell / Recast 7s Double the cost of your next buff spell to grant a bonus on duration effect / Impossible to stack with Diffusion and Unbridled Wisdom/Learning
It will work similar to pianissimo with the recast time to allow us to get buffed
i don't think for many spells that making them during twice is enough on the other hand buffs like refresh or haste could reach a peak of 10m of duration, if you think it well there will be no difference since the ratio MP/Duration will still be the same.
Nature's Meditation Boost ->3M
Orcis Counterstance Boost ->4M
Cocoon boost -> 3M
Barrier Tusk ->4M
Battery Charge ->10M
Haste's Spells -> 10M
Here we are, we have solved the problem of BLU magic Duration and diffusion.