erc-button-wrap-long-urls

erc-button-wrap-long-urls is a variable defined in `erc-button.el'.
Its value is

nil

Documentation:
If non-nil, "long" URLs matching `erc-button-url-regexp' will be wrapped.

If this variable is a number, consider URLs longer than its value to
be "long". If t, URLs will be considered "long" if they are
longer than `erc-fill-column'.

You can customize this variable.