It'd be really useful to see approximate service durations in the Journey Mode UI, especially while there's no save function available. I know that information is available on the timetable UI, but I couldn't see it anywhere inside the Journey mode menu.
You can usually tell by the action points required for gold the service length and obviously route knowledge, but agree it would be helpful if this was included.
The services in journey mode are mostly end to end runs with a couple shorter runs for most routes. But like redrev and you said, it would be useful to know