How much does Turbo boost team damage?

The buff is flat and team-wide, so every Aniimo in the party hits harder while it is up, whatever their element. That is the main difference from a buffer like Spark Elf, whose core skill Inspiration raises the team's fire damage by 16%. Spark Elf gives slightly more, but only to fire. Turbo's 15% applies to the whole team and also improves break efficiency, so it suits mixed teams.

Turbo's Nimi Burst carries the same 15% damage increase along with a break efficiency boost, and that version lasts 20 seconds. Treat it as a window: line up your heavy hitters and your break attempts inside it rather than firing the buff and swapping to something slow.

Getting the buff out of Turbo in each mode

Because the damage boost sits on Turbo's core skill, you get it from Turbo without fielding it full time. In Holo Battle Interlink the second to fourth slots can use only their core skill, which is exactly the skill that carries the buff. In Egg Heist you can call on the core skills of your three benched Aniimo by switching to them.

Turbo also builds Shrouded in Mist stacks passively while off the field, reaching it after 20 seconds. Sitting on the bench is part of how it works.

The cost is energy. EP comes from one pool shared by the whole party, so every time you trigger Turbo's skill, the rest of your team has less to spend. Fit the buff into your rotation instead of spamming it.

Not settled: The 20 second duration applies to the Nimi Burst version. How long the core skill's 15% lasts is not stated, and neither is the exact size of the Nimi Burst's break efficiency boost.