I fill my lettuce seedling trays with about an inch of water and then drain what's left after 12 or 24 hours +/-. If there is only about 1/4 inch of water left I just leave it there. Lettuce likes a lot of water. Then repeat every two to five days depending on the weather (they are usually kept outdoors)
If I were going on vacation I would put an inch or more of water in the tray depending on the temps.
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