Butercrunch lettuce are temperature tolerant plants. 

~55 days to grow a full head of lettuce

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Day 1 - Placing the seeds inside a moist cotton ball. 

I started by taking normal cotton balls you get at a pharmacy store and add a little bit of water. Then I wrung or squeezed the rest of the water out of the cotton ball. The cotton threads a pulled slightly to create a pocket for the seed. Then close it gently and let it sit near the window for temperatures ~ 75*F. 

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Day 3 - Seed germination

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Day 7 - Leaves growing