Hi @jornok,
Could you please share a bit more about your scenario?
Do you want to measure/calculate the time each person took in each step within your Navigator App?
I agree with @RandyHayes's thought almost. Based on the needs that you mentioned, I think the Timer control could achieve your needs.
On your side, you should add one Timer control (Timer1, Timer2, Timer3, ...) within each step (screen) of your Navigator App. When you click "Navigate" button within each step (Screen) to navigate to next step (screen), calculate/measure the time you took within this step.
I have made a test on my side, please take a try with the following workaround:
First Step
Step2
Step3(Last Setp)
Set the OnVisible property of the first screen of your app to following:
Clear(TimeCollection)
Configure the Timer control (Timer1, Timer2, Timer3, ...) within each step (screen) of your Navigator App as below:
Set the Duration property to following:
60000*10 /* <-- 10 Mins. On your side, you should specify the Max Time each step may take */
Set the AutoStart property to following:
true
Within the Step1 (Screen1), set the OnSelect property of the "Next" button to following:
Collect(TimeCollection, {Step:"Step1", Time: Timer1.Value/1000});
Navigate(Screen2, ScreenTransition.Fade);Reset(Timer1)
Within the Step2 (Screen2), set the OnSelect property of the "Next" button to following:
Collect(TimeCollection, {Step:"Step2", Time: Timer2.Value/1000});
Navigate(Screen2, ScreenTransition.Fade);Reset(Timer2)
Within the Step3 (Screen3, On my side, it is the Last Step), set the OnSelect property of the "Finish" button to following:
Collect(TimeCollection, {Step:"Step3", Time: Timer3.Value/1000});Reset(Timer3)
Note: On your side, you may have many steps. On your Last Step, you need to add a "Finish" button as above rather than "Next" button.
After that, the TimeCollection would be populated with Time value (seconds) for each step. The screenshot as below:

Then you could use the following formula to calculate the Total Time took within your Navigator App:
Sum(TimeCollection, Time)
Best regards,