For me it seems as if the lettuce pops up quickly but does take a little longer before you start seeing it getting bigger. I am trying to think of when I started mine over three weeks and I am now seeing the second leaves on a few but not all of them.
All good answers,in my opinion, looking at it to often,too, seems to slow it down.I've started peeping out the window,cause I want it to hurry up so we can wilt it with vinegar and oil and put some in a plate beside some crispy bacon and golden brown corn bread..lol Eddie Buck
Again Heavy Feeder, If you let it dry out for a day, it will take three days to catch up, I stuffed old hay around my lettuce as soon as it starts to come up, Keep it Moist and Fertile, and you will eat lettuce, Oh! it all will be ready to harvest with in three days of each other, Good Luck, Grady