One verse

Srimad Bhagavatam 3.11.38

3.11.38

कालोऽयं द्विपरार्धाख्यो निमेष उपचर्यते । अव्याकृतस्यानन्तस्य ह्यनादेर्जगदात्मन: ॥ ३८ ॥

kalo ’yam dvi-parardhakhyo nimesa upacaryate avyakrtasyanantasya hy anader jagad-atmanah

kalah
eternal time
ayam
this (as measured by Brahma’s duration of life)
dvi-parardha-akhyah
measured by the two halves of Brahma’s life
nimesah
less than a second
upacaryate
is so measured
avyakrtasya
of one who is unchanged
anantasya
of the unlimited
hi
certainly
anadeh
of the beginningless
jagat-atmanah
of the soul of the universe.

The duration of the two parts of Brahma’s life, as above mentioned, is calculated to be equal to one nimesa (less than a second) for the Supreme Personality of Godhead, who is unchanging and unlimited and is the cause of all causes of the universe.