A while ago, I obtained a somewhat large quantity of 120 Ektachrome. I knew it was seriously outdated, but since it was out of it's boxes and even it's foil wrapper, I did not know how old. I guessed it was at least 5 years out of date.
I wasn't even sure of the storage. I did know that it had been stored at room temp for at least a year before I obtained it.
Anyway, I recently shot and had a roll processed. Looked just fine to me; exposure was right on and no evidence of color shift. Speaks well for the longevity and stability of the film.