Njunin's page

Since most shaman spirits are based around an oracle mystery of the same name, maybe it makes sense to compare it to what was most likely the inspirational revelation:

Sacred Council (Su): As a move action, you can call upon your ancestors to provide council. This advice grants you a +2 bonus on any one d20 roll. This effect lasts for 1 round. You can use this ability a number of times per day equal to your Charisma bonus.

This would support your assumption that there was just a "one" lost in editing. On the other hand, the ability was changed beyond just that and comparing the spirit ability to some of the other spirit's abilities that provide a numerical bonus to rolls, a single +2 for investing a standard action sounds rather underwhelming, so I'm left wondering if it might have been intended? But this admittedly goes beyond RAW.

The Shaman's Ancestors spirit from Cohorts and Companions has the following spirit ability:

Ancestor's Council (Su): As a standard action the shaman can call upon her ancestors to provide advice and assistance to one ally within 30 feet. The ally gains a +2 bonus on any attack roll, saving throw, ability check, or skill check made before the beginning of the shaman’s next turn. The shaman can use this ability a number of times per day equal to 3 + her Charisma bonus.

I am unsure on the wording here. Does this apply only on the very first roll and then the effect is discharged (therefore giving a +2 on only a single roll) or is it essentially a flat +2 bonus on every such roll for 1 round?