Stir yeast and water in stand mixer bowl and let stand until foamy, about 10 minutes.
Mix in olive oil, salt, and 4 cups flour then mix with dough hook until combined.
Scrape down sides of bowl.
Continue adding flour, 2 cups at a cup at a time, mixing until incorporated and a shaggy dough forms, about 3 minutes.
Increase speed to medium and mix until dough pulls away from sides of bowl and is lightly elastic, 5–6 minutes.
Place in a lightly oiled bowl and cover with plastic wrap. Chill 24 hours.
Coat 2 half sheet pans with ½ cup olive oil each. Turn out half of dough onto each baking sheet and let sit 10 minutes to warm up.
Stretch dough gently to cover the sheet pans - this may require giving the dough a few more minutes to rest and a couple rounds.
Cover dough on baking sheet with a damp cloth and let sit in a warm place (about 70°) until it is puffy and full of bubbles, like a focaccia. This will take about 30 minutes - plenty of time to prep the other ingredients.