What is the period after which recent conversion to Islam is considered an impediment among the impediments to declaring someone an apostate?

One who denies the obligatory duties is not to be excommunicated (kafir) if he is new to Islam until proof is established against him. This applies to everyone whom the evidentiary proof of the message has not reached; he is not to be excommunicated, declared a fasiq (transgressor), or a mubtadi' (innovator) until after it has been established. Allah has forgiven this Ummah for its mistakes, and the Salaf (early Muslims) disputed many issues without excommunicating anyone. Excommunication is a form of warning, and one must differentiate between issuing a general statement and applying it to a specific individual. A person might be new to Islam, or have grown up in a remote desert, or the texts might not have reached him. Such a person is not excommunicated until proof is established. There is no need to set a time limit for being new to Islam, as the intent is to give an example of someone who is ignorant of that which causes excommunication.