Does my Vestigeforged Arcanadancer have 8-day buffs?

[Kaje]

Ok, so I built a warforged binder / fighter / suel arcanamach / spelldancer / abjurant champion who dances himself buffed at the beginning of the day (with no ill effects from the dancing :smallbiggrin: ). Do SA's Extended Spellstrength, AC's Extended Abjuration, Extend Spell and Persistent Spell stack to make abjuration spells that can last 8 days?

[Chilingsworth]

irrc, at least the Abjurant Champion's ability describes it as functioning "as per the extend spell feat, but without increased spell level or casting time." This being the case, using it with extend spell would be impossible (you can't apply a metamagic feat more than once to a spell.) Also, in D&D two doubblings equal a trippling, three equal a quadrupling, so the max you could get would be 4 days, even if those abilities stacked. And that only for abjuration spells, since the Abjurant Champion ability only works on them.

Most likely, the other two abilities also count as Extend Spell, so the most you could get would be two day buffs (stacking extend and persist.)

[Kaje]

The class features say "as if affected by the Extend Spell feat" or "as if you had applied the Extend Spell feat". The key here is "as if". You haven't applied the feat to them; they just double as though you had.