What is the Maximum Characters allowed in a sinlge assembly line?

I am using ADSP-21XXX and facing an issue with assembly comments. Technically, the comments should not create any issue. But in my case, if i delete some portion of the comment, it works. So I've thought of posting a question to know, how many characters are allowed in a assembly line? For example, we can use C style comment (/* ... */) and backslash ('\') to have multiple line comment or code in asm file. In both the cases, there should be some limit, which really gives me problem. Hope, somebody can help out here.