If it is properly stored and never exposed to enough moisture for mold to grow, it will never mold.
Days
It takes about a week
12 to 14 days
about 9 days
WHeat takes about 2 months TO GROW
2days unrefrigerated
50000
5000 years
50,000 years
about 1 week
How long it takes for lettuce to grow mold depends upon the conditions it is stored in. If the lettuce is stored in humid or damp conditions, it will grow mold in a few days.
3-4 months