This doesn't really answer your question of what frequency is best for this or whether the growing history is going to be a big problem but if you're concerned with pushing this data into your Confluence all the time you could go the opposite route and pull it upon page view.
Using a tool like PocketQuery you could execute arbitrary REST requests upon page view and display their result using a macro. You can even configure your own cache period so your pages being hit "hundreds of times a day" shouldn't be a problem (as long as you're fine with the data only being updated every 5 minutes or so).
If you're sticking to the push method it would probably be a good idea to find a way to frequently delete old page versions. It seems this app would do the job in that case.
Best,
Sven (Scandio, makers of PocketQuery)
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