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The best way of keeping tabs on stars like this is to plan a few days before, an observing run over at least two nights. That'll give you a good spread so far as the time is concerned plus a little leeway if you miss a measurement or two for various reasons. If he can repeat the run a few days later, then he can compare and contrast the results and get a good handle on the variability of the system.
Ideally, he should plan his run around the given ephemeris for the system. That way he can compare his results with the known characteristics of the system.
This would be an ideal system to generate a photometric based set of observations for a project. You could really tie down the period of the system, the length of the eclipse, the orbital elements etc. Pity he doesn't have a CCD camera. Even a mono DSI would be OK for the job.
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