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The Swords Bard's 3rd level feature, Blade Flourish, states:
[...] Whenever you take the Attack action on your turn, your walking speed increases by 10 feet until the end of the turn [...]
So if a Bard took the Attack action multiple times (through something like haste or Action Surge) would they gain the speed increase multiple times as well?
The Dungeon Master's Guide errata (pdf link) added the "Combining Game Effects" section which states (emphasis mine):
Different game features can affect a target at the same time. But when two or more game features have the same name, only the effects of one of them—the most potent one—apply while the durations of the effects overlap. [...] Game features include spells, class features, feats, racial traits, monster abilities, and magic items. [...]
Since game features include class features one would think that we can conclude that two instances of Blade Flourish's speed increase would not stack; but in this case, there is no overlapping duration. We can conclude this by looking to the Essentials Kit, which includes a "Effects with the Same Name Don't Stack" section (page 3) stating (emphasis mine):
[...] But when two or more effects have the same proper name, only one of them applies while the durations of the effects overlap (a duration is a time span of 1 round or more). [...]
This defines what counts as a duration and in this case, the Blade Flourish's speed increase lasts until the end of the current turn (less than 1 round), thus you can benefit from the speed increase multiple times if you took multiple Attack actions.
Small sidenote:
The Bard's feature triggers "whenever" you take the Attack action, this means that it occurs every time you take the Attack action, similar to how Extra Attack triggers every time you take the Attack action. If the rules wanted "whenever" to mean only the first time or only once they would use "the first time you take the Attack action" or state that the speed increase can occur only once per turn like they do with many other features.
It’s an odd phrase because AFIK, if it isn’t your turn, you can’t take the Attack action. So, what is the point of including “on your turn”? The only thing I can think of is they are trying (and failing) to make it clear that it doesn’t matter whether you take the Attack action before or after you move.
Notwithstanding, we need to focus on the word whenever and what it means:
at whatever time
at any or every time that
If we use the first then if you take any number of “Attack action on your turn, your walking speed increases by 10 feet until the end of the turn”. Therefore you only get it once.
If we use the second definition then, each time “you take the Attack action on your turn, your walking speed increases by 10 feet until the end of the turn”. Therefore you get it once per Attack action.
Neither interpretation is obviously wrong so it’s DM’s call.
