Banana cake can be made in a square tin, sheet pan or a 25cm round tin, depending on preference or what you have available. I prefer a 10 x 10 inch (25cm square) baking tin for the height, final size and cooking time. Using a 10 x 10 pan makes the cake into 20 serves. Smaller tins or loaf pans can be used (make sure the tin is large enough to hold the batter), but cooking times will vary for each. I have also made this cake in a 8 x 8 inch tin. When using the 8 x 8 tin, the cooking time increases to about 60 minutes and the cake will be noticeably browner on the outside when ready, as it will take longer to completely cook through.