What's your default RTH height ?

[SlabRyder]

20 metres

 

[Thomas B]

40 meters ... but will adjust if higher obstacles are present in a flight plan area.

 

[EyeFlightDrone]

If set too high, the calculation for the rth will take much longer making your rth alerts happen much faster. Happy Flying!

 

[Jake 61]

Depends on surrounding obstacles.
I normally don't use RTH, I'd rather keep things in sight. If I do, it's 30m.