I found many answers during a search, they ranged from 14 hours to 1 week. The most official answer I could find was from a government website here:
http://www.ncbi.nlm.nih.gov/books/bv.fcgi?indexed=Google&rid=mboc4.section.4113
That said:
"In the small intestine, stem cells in the crypts generate new absorptive, goblet, enteroendocrine, and Paneth cells, replacing most of the epithelial lining of the intestine every week. The diverse fates of the stem-cell progeny are controlled, in part at least, by the Notch signaling pathway, while the Wnt pathway is required to maintain the stem-cell population."
Every 3 days
If your stomach didn't produce a new layer of mucus every week, it would digest itself.
produce new cells.
The Bascal Cell Layer, the deepest layer where cells divide to produce new skin cells.
Every 3 days.
The basal layer of the epidermis contains stem cells that continuously divide and differentiate to produce new epidermal cells. These stem cells are responsible for regenerating the skin's outer layer.
generation through mitosis of new cells to replace the stomach lining
Most all living spiecies it's how we digest our food, stomach acid in a human is some of the most powerful in the world we have to produce a new layer of mucus every two weeks in our stomah to keep from digesting our own selves
The basal layer is the epidermal layer that produces new cells through mitosis. This layer is located at the bottom of the epidermis and contains stem cells that continuously divide and give rise to new skin cells.
Female rattlesnakes produce a new litter every 3 years on average.
Polyploid may instantly produce new species of plantsthat are often strongerthan rhier diploidrelatives
Layer > New > Background from Layer.