Raphael,

8K (although I ran this test in VFP8)

Here's the test code I used:

lcBigStringConstant = ["] + replicate( "1234567890", 25 ) + [a"]
lcEvalIt = lcBigStringConstant
for i = 1 to 100
   lcEvalIt = lcEvalIt + " + " + lcBigStringConstant
   lcTest = eval( lcEvalIt )
   ? i, len( lcEvalIt ), len( lcTest )
endfor

>what is the max amount of characters that can be an argument to EVAL() ?
>It seems to be more than 256 (somewhat suprisingly) but I need to know what its limit is.