Sourdough bread lasts 7 days without going stale?? Perhaps this depends on your climate. For me, plain sourdough is notably worse the next day and pretty crappy within 2-3. I assume people with no access to preservatives would have gotten used to this and would be more willing to eat food I consider bad tasting, but still.
Note, though, that this only applies to sourdough with just flour and water, no dough enrichment; breads with even small amounts of oil and sugar added stay soft much longer.
This is amazing, thanks for sharing! I’d be interested in your children’s curriculum if that’s something you can share as well.