From Xojo Documentation
Returns the number of microseconds (1,000,000th of a second) that have passed since the user's device was started.
|result||Double||The number of microseconds that have passed since the user's device was started.|
Because modern operating systems can stay running for so long, it's possible for the device's internal counters to "roll over." This means that if you are using this function to determine how much time has elapsed, you may encounter a case where this time is inaccurate.
The machine's internal counters might or might not continue to advance while the machine is asleep, or in a similar power-saving mode. Therefore, this function might not be suitable for use as a long-term timer.
This code displays in message box the number of minutes the device has been on: