# RtlTimeEstimate (UORB message)

[source file](https://github.com/PX4/PX4-Autopilot/blob/main/msg/RtlTimeEstimate.msg)

```c
uint64 timestamp # time since system start (microseconds)

bool valid			# Flag indicating whether the time estiamtes are valid
float32 time_estimate		# [s] Estimated time for RTL
float32 safe_time_estimate	# [s] Same as time_estimate, but with safety factor and safety margin included (factor*t + margin)

```