No. The Holy Qur'an was not revealed completely all at once. Rather, it was revealed bit by bit. The verses contained in it were revealed against the backdrop of varying circumstances over a long period stretching between twenty- three years. There was no fixed time period during which the Prophet received the divine revelation. There had been instances when the Prophet had received revelation more than once in a single day. Sometimes it was only a few words that were revealed, full words that were, in their turn, to be placed in a particular position within a particular chapter. On some occasions,whole chapters where revealed to the Prophet at a streach.
Indeed, the Qur'an's has been a compilation of verses that were revealed according to the circumstances and occasions that demanded them.