How long do you need it to be?
Why do you think you need to "increase foot note length"?
Default length of Title and Footnote lines is based on your LINESIZE SAS system option and may vary by OS but I expect likely to be 256 characters.
Since you can have 10 Footnotes defined at any given time that is about 2,560 characters. If you need more than that you probably should be using something other than footnotes.
Perhaps you weren't aware of all of the Footnote, Footnote2, Footnote3 ... Footnote10 statements available?
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