Anyone know the maximum number of characters that can be used within an equation?

Is this too long?

Example:

“thick”=IIF((“gage” LIKE 7),0.180,(IIF(“gage” LIKE 8,0.165,IIF(“gage” LIKE 9,0.148,IIF(“gage” LIKE 10,0.134,IIF(“gage” LIKE 11,0.120,IIF(“gage” LIKE  12,0.109,IIF(“gage” LIKE 13,0.095,IIF(“gage” LIKE 14,0.083,IIF(“gage” LIKE 1/8,0.125,IIF(“gage” LIKE 3/16,0.1875,IIF(“gage” LIKE 1/4,0.25,IIF(“gage” LIKE 3/8,0.375,IIF(“gage” LIKE 1/2,0.5,IIF(“gage” LIKE 5/8,0.625,0)))))))))))))))

Thanks in advance.

Nick