Sometimes, I think this kind of things has more to do with sport then with music. The fact that someone tries to do something like this in order to test if he can get through it and remain concentrated, sounds just like someone who wants to know if he can ride 500 km on a bike on one day. I think the quality of the performance will be suffering under the quantity, and moreover the sonatas have no relationship between them as far as I know, like the cycle of Suites for cello for instance.
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