That's not how the convictions for these kinds of crimes are structured. Any incarceration times will be structured to run concurrently instead of consecutively. According to CBS reporting "The minimum sentence for falsifying business records in the first degree is zero, so Trump could receive probation or conditional discharge, a sentence of no jail or up to four years for each offense. Trump would likely be ordered to serve the prison time concurrently for each count, so up to four years, total."