Operating parameter

Limit

Macro size

Limited only by available memory

Length of variable, subroutine, and user-defined function names

40 characters (Word version 6.0)
80 characters (Word version 7.0)

Length of string variables

65,280 characters

Highest number

1.7976931348623 x 10308

Number of arguments that can be passed to a subroutine or function

20