Internal Limitations
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The maximum width of an alphanumeric variable is 32,000 characters.

Variable names are limited internally to a maximum length of 255 characters. 

Data are generally processed one case at a time, so the number of cases is not limited.  Exceptions to this are the worksheets and file formats that must be transposed, such as S-Plus. These transfers are limited by available virtual memory.  It is unlikely, however, to be a problem.