Peter Barker

Ping @dinhthong - needs some attention.

> sorry everyone, I can't work on this right now because of the environment setup on my machine. I will get back when I have time. @peterbarker Should I close...

Could you work up an autotest for this, please?

> sure, just added an autotest in quadplane. It performs an auto mission with two NAV_DELAY commands. The first one happens when the aircraft is in VTOL mode (so shouldn't...

@nexton-winjeel I think this PR is now no-longer-required as we're going to use `FLIGHT_INFORMATION` instead, correct?

> @peterbarker: It's not required as-is, but I'll convert it to use `FLIGHT_INFORMATION` instead of the now non-existent `FLIGHT_DURATION`. Will get to it early next week. Long week?

Closes https://github.com/ArduPilot/ardupilot/issues/25284

> I think this should be disabled by def and a build option...not going to be used by 95% of users....or at least disabled in minimize include...also needs file for...

In-progress MAVProxy support is here: https://github.com/ArduPilot/MAVProxy/pull/1438 Works ~, but I've broken other stuff in a refactor~

Ping @nexton-winjeel - might still be viable for 4.6 - but even than had better be soon :-)