Moises,
yes, the maximum length of a string literal is 255. See Visual FoxPro System Capacities in Help.
Anyway, the preferred way to write long text into a variable, is to use Text-Endtext which also makes it much more readable

Text to cSQL Noshow Pretext 1+2+4+8
   INSERT INTO correios 
   (nome,email,endereco,numero,bairro,cidade,CEP,
   estado,telefone,nome_ent,email_ent,numero_ent,
   bairro_ent,cidade_ent,cep_ent,estado_ent,telefone_ent)
   VALUES (?cl, ?e_mail1, ?rua, ?no,?bairro,?cidade,?cep,?est,)
Endtext

Notice that you can break up the line if you want.

>Hi
>
>Looks like there is the maxium lenght, even using "; "
>
>Beyond this limit, there is error message.
>But I need to insert many values.
>
>Is there lenghs limits in VFP and a way to overcome the problem below ?
>
>

>cSQL = 'INSERT INTO correios (nome,email,endereco,numero,bairro,cidade,CEP,estado,telefone,nome_ent,email_ent,numero_ent,bairro_ent,cidade_ent,cep_ent,estado_ent,telefone_ent);
>VALUES (?cl, ?e_mail1, ?rua, ?no,?bairro,?cidade,?cep,?est,)'
>

>
>(looks like limit is valid for the sum of both lines)