About 6-8 days.

According to the Flower Encyclopedia website, lettuce seeds must be germinated before sowing. You can wrap the seeds with wet cloth and put them in the refrigerator. Rinse the seeds with cold water once the next day, about 3- The seeds will turn white in 5 days and can then be sown into the soil. Prepare suitable loose soil, sow the lettuce seeds, maintain a suitable temperature, and have appropriate exposure to astigmatism. They will germinate in about 6-8 days.

Lettuce (scientific name: Lactucasativavar. angustata), also known as lettuce, is a lettuce species of the genus Lactuca in the Asteraceae family that can form a variant of fleshy tender stems. It is an annual herbaceous plant. Also known as stem lettuce, lettuce shoots, green bamboo shoots, and lettuce. Maternity period: January to April. Lettuce originates from the Mediterranean coast and was introduced to China around the fifth century. The above-ground stems are edible. The stem skin is white-green, the flesh of the stem is crisp and tender, the young stems are emerald green, and turn white-green when mature. The main edible fleshy tender stems can be eaten raw, cold, stir-fried, dried or pickled, and the young leaves can also be eaten.