How often? Under what circumstances?In the PCA, Methodist, and some Baptist churches, it was a weekly part of the order of service. In the more evangelical churches, it was not part of the regular order of service, but I'd say at least 3-4 times a year.
Does 3 or 4 times a year comport with the implication of the writer of the opening piece of this thread?
Protestants generally don't see that their own argument isn't completely consistent. There may be no particular virtue in repeating the same prayer over again, but Protestants will cheerfully pray the "Our Father..." weekly and daily throughout their lives anyway.
I am PCA and we never say the Our Father in service BTW