SB 12.4.2

catur-yuga-sahasraṁ tu
 brahmaṇo dinam ucyate
sa kalpo yatra manavaś
 caturdaśa viśām-pate
Word for word: 
catuḥ-yuga — four ages; sahasram — one thousand; tu — indeed; brahmaṇaḥ — of Lord Brahmā; dinam — the day; ucyate — is said; saḥ — that; kalpaḥ — a kalpa; yatra — in which; manavaḥ — original progenitors of mankind; caturdaśa — fourteen; viśām-pate — O King.
Translation: 
One thousand cycles of four ages constitute a single day of Brahmā, known as a kalpa. In that period, O King, fourteen Manus come and go.