You have 2 weeks (10 working days) in which to submit the documents.
It is certainly possible that the application may be refused if you have not provided any documents within the given time scale. The Home Office wouldn't have any documents to consider for the application and as such could refuse it.
Whilst the caseworkers do have what is called ''evidential flexibility'' in which they do have the ability to write out to request certain evidence, they are not bound by this and they would not use this in order to request every single document that is needed for the application. It would be used in cases where, for example, a bank statement was missing.