Q- What is the reliability of this Hadith? The life of my community will not extend over more than 1500/2000 years.?
haven’t seen this Hadith in the popular Hadith books, neither has ‘Allamah Suyuti (rahimahullah) mentioned any such narration in his article on this subject. (Al-Hawi, vol.2 pg.248-256)
However some Scholars have made this claim based on a combination of narrations. Several other reliable ‘Ulama have refuted this, as Allah Ta’ala has kept the knowledge of Qiyamah and the end of the world a secret.(Refer: Fathul Bari, Hadith: 6503-6505. Also see Al-Maqasidul Hasanah, Hadith: 1243)
And Allah Ta’ala Knows best,
https://hadithanswers.com/is-the-total-lifespan-of-this-ummah-1500-yrs/