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Timing an activity

I am attempting to implement a timer to record the time elapsed while an
activity ( such as recording a track from a vinyl record) is proceeding. I
found the following code snippet-posted by an Apple engineer-which I thought
would be applicable:

[BEGIN]

AbsoluteTime start = UpTime();

// stuff to be timed
.
.
.

AbsoluteTime stop = UpTime();

AbsoluteTime delta = stop - start;

double seconds = AbsoluteToNanoSeconds(delta) * 0.000000001f;

[END]

However, I found that "AbsoluteToNanoSeconds"-rather than returning a
double, returns a UnsignedWide struct, consisting of UInt32 hi and UInt32
lo. (Also, since Absolute time is the same struct, the compiler complains
that stop and start and not valid variables) -(I did attempt to read the
headers).

In my abysmal ignorance, I do not know how to convert this struct into a
number which I can use.
Am I completely on the wrong track?
Any advice would be greatly appreciated.
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