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The bottom layer curing settings apply only to the number of layers configured in the settings panel appropriate to that option.
A gaming piece placed flat on the build plate would have curing times to match the above-noted settings for the specified number of layers. All subsequent layers would be cured with the (probably) faster/shorter curing time ...
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If you put the object directly on the bed, the lowest part of the object will be cured as the bottom layer. And yes, you can sand it away depending on the shape of the object.
For such large objects, you can also use a feature called Double Exposure, it is available on few slicers and easier to deal with.
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It seems easy to calculate but it is not.
Due to acceleration and deceleration, the movement time hard to predict. If you take a look at Atmel source code for movement you would get clear idea.
Usually these boards contains RAMPS compatible firmware running on a separate micro controller. Any value change on this side such as movement parameters are not ...
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Running multiple versions of the same software did not sit well with the software person in me, so I dug a little deeper.
ChiTu has a "settings" button to the right side, and under that section it is possible to configure different, separate printer profiles. That may take care of the differences if properly configured, unfortunately only some ...
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