While Cakedesk does supports arbitrary units, it would be great if you could simply enter a duration in the format "hh:mm" (rather than a decimal number) in the duration field and CakeDesk automatically calculates the total based on this and also displays the duration properly formatted (and not as a decimal number) in exported invoices. For example, if I enter "1:45" at a unit price of 100€, the total amount would be 175€.