One verse

Srimad Bhagavatam 8.13.36

8.13.36

राजंश्चतुर्दशैतानि त्रिकालानुगतानि ते । प्रोक्तान्येभिर्मित: कल्पो युगसाहस्रपर्यय: ॥ ३६ ॥

rajams caturdasaitani tri-kalanugatani te proktany ebhir mitah kalpo yuga-sahasra-paryayah

rajan
O King
caturdasa
fourteen
etani
all these
tri-kala
the three periods of time (past, present and future)
anugatani
covering
te
to you
proktani
described
ebhih
by these
mitah
estimated
kalpah
one day of Brahma
yuga-sahasra
one thousand cycles of four yugas
paryayah
consisting of.

O King, I have now described to you the fourteen Manus appearing in the past, present and future. The total duration of time ruled by these Manus is one thousand yuga cycles. This is called a kalpa, or one day of Lord Brahma.