How to time a function call

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Do not use GetTickCount! You can't time with that. The ticks are not on every system the same.
You can use QueryPerformanceCounter for this.

Code:

LARGE_INTEGER StartTime;
::QueryPerformanceCounter(&StartTime);

//Run the function

LARGE_INTEGER StopTime;
::QueryPerformanceCounter(&StopTime);

LARGE_INTEGER PerformanceFrequency;
::QueryPerformanceFrequency(&PerformanceFrequency);

double Frequency = PerformanceFrequency.QuadPart;
double TimePassed = ((StopTime.QuadPart - StartTime.QuadPart) / Frequency);