Yes, only one day of processing is impossible for any kind of integrated circuit.
One day of processing would be possible only for semi-custom integrated circuits, like gate arrays, which have already been fabricated until a last step that only adds one or two custom metal layers to interconnect the existing components and then separates and packages the devices.
Even with that, one day of processing would be possible only for making a small number of chips, where the metal layers would be patterned without masks, by direct exposure of the photoresist with a laser projector. Making photolithography masks would take more than one day.
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Yes, only one day of processing is impossible for any kind of integrated circuit.
One day of processing would be possible only for semi-custom integrated circuits, like gate arrays, which have already been fabricated until a last step that only adds one or two custom metal layers to interconnect the existing components and then separates and packages the devices.
Even with that, one day of processing would be possible only for making a small number of chips, where the metal layers would be patterned without masks, by direct exposure of the photoresist with a laser projector. Making photolithography masks would take more than one day.