To me,
a 48-hour period for the acetone to evaporate
seems excessive and potentially counterproductive consider how rapidly acetone evaporates and how cocaine hydrochloride tends to be hygroscopic (draws moisture from the air around it). Are you sure you aren't conflating the drying of the end product with the necessary desiccation of the acetone through the use of a drying agent like magnesium sulfate? In this instance, you let the jar sit in the freezer for something like 48 hrs so the MgSO₄ settles and carries residual bits of water down with it. Now you can either decant icecold, anhydrous acetone from the jar, or use a pipette to transfer same. Forgive me if you already know the above info.
Also, you can usually purge something like acetone out through use of a vacuum chamber, like what's used for degassing butane hash oil. Also worth mentioning is the fact that any cuts containing an amine group (NH₃) will bond with acids to form water-soluble salts, just like cocaine does, and will likely not be removed via acetone wash nor acid/base extraction. Although, regarding A/B extraction, it is possible to take advantage of the fact cocaine forms a freebase crystal (read: rock). It's kind of like whipping and re-rocking only you want to wash away all traces of baking soda instead and just keep the resulting freebase (note: I'm intentionally not using the term ‘crack’ here b/c I tend to think of it as cocaine cut with the same sodium bicarbonate used to free it from the HCl molecule to begin with). Do note: the product loss here can be astonishing as the majority of cocaine outside of South America is heavily cut. In my experience a yield of ~50% is not uncommon, but the resulting cocaine flakes are absolutely incredible if you know what you're doing, you're meticulous in approach and execution, and the initial product was decent to begin with…
To me, washing cocaine is a much more delicate operation with less room for error compared to washing meth. Regardless, I think you already know the answer to the question regarding tweakers being impatient (let's just say deferred gratification does not come easily to some people), lol. Good luck!