If by pressing the top of the cake with the finger it will spring back without leaving the impression of the finger, the cake is done through.

Great care should be taken that the oven is not too hot to begin with, as the cake will rise too fast and settle or fall in the baking.

It should bake in from 35 to 40 minutes' time.
When done, invert the pan and let stand until cold before removing it.
Should you see cake browning before it rises to top of pan, throw your oven door open and let cold air rush in and cool your oven instantly.
Be not afraid.

The cold air will not hurt the cake.

Two minutes will cool any oven.