He? It means that you can combine multiple entries into one line, to save ink. The idea of trying to do that with multiple aircraft is what, April fools? But maybe this age we should add "all other parameters being equal", so we do not have to think too much.
2x 1h flight is logged as that - combined 2 hrs and 2 landings. Block off / in from the first to last movement. The stopover time is not added to the combined flight time.