50
GNU APL and ngn/apl use UTF-8, so use a byte counting tool.
NARS2000 only uses UCS-2, so 2 bytes per character.
IBM's APL2 is the only modern APL that natively supports APL EBCDIC, so 1 byte per character.
Dyalog APL uses any Unicode format, or the classic Dyalog character set (Table 1 below).*
...