Waiting For 1 Second Code Time Error Is Too Large

Time accuracy is affected by the number of threads. When the number of threads increases, the longer the code waits for 1 second to execute, the greater the error from the actual time.
When the number of threads is smaller, the code execution time waiting for 1 second is shorter than the actual time.
When using an infinite loop of waiting for 1 second code as a timer, the error increases over time and is affected by the number of threads.
No matter what spacecraft, what command module, or waiting for "x" seconds, there are significant errors.