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On the Astrotrac I had, the tracking time was actually very close to 2 hours, then press one button and it rewound in just over a minute, so that wasn't really an issue for me, but I can see how it could be for some uses. Getting a full night's use out of a set of AA batteries is nice too.
The surprising thing for me was that it happily held my 4" scope and DSLR and tracked nicely.
There is an option for RA autoguiding now too.
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