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If you fly multiple legs (flights) then you may want to use the Time Calculator. As described here you can log start and end times and Logbook Pro will do the math and also offer a total which you can then transfer directly into the Duration field by tapping the down arrow button when done for the trip. Tap the calculators to the right of the Duration or Simulator buttons if you wish to calculate the time based off of OOOI inputs. If you do not have OOOI inputs . In entered, tapping the calculators will enter the Time Calculator total instead. In each time field you can tap the button on the right to copy in the Duration (or SIM) value to make logging a quick and easy. Tapping into a field will bring up the keypad where you can just press the numbers such as 2 and 5 to log a 2.5 as the decimal will be placed for you. Duration or SIM is a required input for a valid log entry.
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