You're pushing the limits. Give some of the two-row a chew. The biggest problems will be the fats going rancid and the starches getting stale. Both will be obvious.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk