First feeding, mix 40g 100% hydration starter with 20g flour. Ferment for 4 hours. Before my kitchen warmed up with other cooking, I used the oven with the light on which provided a good environment.
For each subsequent feeding (except the final one), discard all but 30g starter and add 20g flour and 10g water. Ferment for 4 hours. Repeat three times a day for 2 days. Keep the starter at room temperature or in a warm place the whole time.
For the final feeding on the morning of the third day, combine 60g starter, 40g flour, and 20g water. Ferment for 4 hours. You will need 100g starter for the recip