It is mentioned in the Sutta.

Mini cycles and major cycles.

Mini cycles: Time for human lifespan to decrease from indefinite years (some say 100,000 )  to 10 years and back to 100,000 years.
Major cycles: Entire universe comes to dissolution at the end of the Aeon (Mahakappa).

If we talk about mini-cycles, some say about 16 or 64 mini cycles will pass before the coming of the destructive phase of the universe cycle.  We are still very far from it.

The Buddha did not say exactly how long one Mahakappa (aeon) is, but he gave a simile and it is indeed a very long time. Some say it's few quadrillion of years.

usually they have their meetings on sundays la...

i am currently collaborating with them to organise a buddhist camp for indonesians la.