How long do you estimate the lifespan of the Islamic nation to be?

The period of the Islamic Ummah extends until the Hour (Day of Judgment) is established. The Prophet, peace and blessings be upon him, said: "There will always be a group from my Ummah, triumphant upon the truth, not harmed by those who forsake them nor by those who oppose them, until the Hour is established." In a narration by Muslim: "There will always be a group from my Ummah fighting for the truth, triumphant, until the Day of Resurrection."