Hi, please help to know that how many formulae in libreoffice calc(4.0.2.2)
Please see bug 35411 for patch details available in LibreOffice 4.0.5. Bugzilla in general is not a service to file support requests. Please search project's wiki https://wiki.documentfoundation.org/Main_Page, ask a question at http://ask.libreoffice.org or post at users mailinglist.
If your question was not about max function length then a list of all functions by category available in LibreOffice is at https://help.libreoffice.org/Calc/Functions_by_Category page.