Recently, I have been making biscuits with baking powder. The whole process takes about 30 minutes...from turning on the oven to ready-to-eat biscuits. Once I get really practiced, I should be able to shave off at least 5 minutes.
I only take about 5 minutes to make, and 12 minutes to cook, So I cook the eggs, bacon whatever while the biscuits bake. I have a mix already made up, and use 1/4 a cup for regular biscuits, and 1/3 cup mix for each big biscuit. Add the liquid, stir till moistened well and drop into greased pans or on baking sheets.
The less handling of the biscuits, the more tender and flaky it is.
One of my recipes calls for mixing and dumping into an 8 inch square cake pan, and cutting the biscuits after they have cooked, so the biscuits are square.