On Windows versions older than Vista, :func:`monotonic` detects
:c:func:`GetTickCount` integer overflow (32 bits, roll-over after 49.7 days).
- It increases an internal epoch (reference time by) 2\ :sup:`32` each time
+ It increases an internal epoch (reference time) by 2\ :sup:`32` each time
that an overflow is detected. The epoch is stored in the process-local state
and so the value of :func:`monotonic` may be different in two Python
processes running for more than 49 days. On more recent versions of Windows