Not sure why there should be a cap at 10 days? Where is that information written?
I think you are able to fecth all guild history data from the past as far as the server is able to retrieve them.
You need to manually update them at the guild history page, using the E keybind several times, like MasterMerchant 3 describes in it's sticky post -> links with howto update data.
But also check the library's description:
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Originally Posted by Histy
Unlike other addons, the library won't request the full range of history provided by the server when you first use it. Instead it will immediately force a link and start collecting data from there. If you want to collect older history in that situation, you will need to manually request it and then hit the rescan button for that guild and category.
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