4-6 hours. It takes about 4-6 hours to make dough using the old method at room temperature of 28°C. "Old method of making dough" refers to using traditional methods to ferment dough. You need to mix dry yeast or acidic yeast with flour, water and other materials, and place it in a Fermentation is carried out at the appropriate temperature. "Twenty-eight degrees" is a relatively high room temperature, suitable for quickly promoting the fermentation and expansion of dough.