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Most repair manuals tell you to let the starter rest for 10 minutes for every 10 seconds of cranking, the first second is the hardest and will produce the most heat as it's moving the engine from a dead stop, so I'm not sure how to factor in that kind of use but I'd say that if you are restarting with the starter more then once every 5 minutes that you are at risk of burning out the starter very quickly, same with the battery cables that go to the starter.
The starter is also drawing around 100 to 200 amps, maybe more and that kind of high load on the battery takes a while for the battery to recover from, I'd guess at least ten minutes of running and if you are repeating that then putting the battery on a trickle charger is very much needed, if not at home then maybe at work?
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