GetThreadTimes

[DllImport("Kernel32.dll")][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetThreadTimes(
   IntPtr hThread,
   out FILETIME lpCreationTime,
   out FILETIME lpExitTime,
   out FILETIME lpKernelTime,
   out FILETIME lpUserTime
);

Microsoft documentation: Link