How long does it take to make Cream Layer Cake?

A torte cake in a 24 cm pan, baked at 180°C (355°F) for 20–25 minutes and cut into 3–4 layers.

#	What to do	How long
1	Preheat the oven to 180°C (355°F)	—
2	Whip the eggs and the sugar 6–8 minutes	—
3	Add and mix on low speed, just	—
4	Sift the flour and baking powder over the top and Fold gently, just	—
5	Pour into a round pan 24 cm in diameter	—
6	Bake 25 minutes	—
7	Let the cake cool completely	—
8	Whip the cold cream on medium speed	—
9	Add the sugar and vanilla and keep whipping on high speed to firm peaks	—
10	Cut the cooled cake horizontally into 3 layers	—
11	Spread cream between the layers	—
12	Cover the cake with the rest of the cream	—

Put things in the oven only once it's reached temperature, after the heating light has gone off: an oven that hasn't reached temperature changes baking times, and the bake burns outside or stays underbaked.
With whole eggs, all the rise comes from the whipping: whip until the mixture leaves a ribbon on its surface, and fold in the flour gently so the air doesn't escape.
Fold with a spatula, in broad strokes from the bottom up, and stop when there are no streaks: vigorous mixing knocks the air out of the foam. Add whipped mixtures in stages: a quarter first, to lighten the mixture.
Fold with a spatula, in broad strokes from the bottom up, and stop when there's no dry flour: vigorous mixing of a batter with flour develops gluten.
Cold cream whips quickly and holds firm: warm cream won't hold air. Stop when the peaks are firm, before it turns grainy.
Whip cream very cold, in a chilled bowl with chilled beaters, and stop when it holds firm: overwhipping turns it grainy and buttery.

Check by the cue (until…), not just the clock: every oven bakes a little differently.

For the torte: 6 eggs, a cup of sugar, a cup of flour and a teaspoon of baking powder, in a 26 cm pan at 175°C (345°F) for about 40 minutes.
Stabilized whipped cream (about 720 g heavy cream with 60 g sugar) between the layers and on the sides; chill about an hour until the layers set.