As per Chapter 19, Prabhasa Khanda of Skanda Purana, Parvati Devi was born to Himavan at end of Chakshusha Manvantara (6th Manvantara) and beginning of Vaivasvara Manvantara in Varaha Kalpa.
As per this chapter, Varaha Kalpa is 31st Kalpa in 51st year of Brahma. 30th kalpa was Pitri Kalpa and Sati was born in Swayambhuva Manvantara (1st Manvantara) of Pitri Kalpa. Rudra lived without Shakti for period of 21 Manvantaras (14 in Pitri Kalpa and 7 in Varaha kalpa).
Lord Shiva says
54-56. In the second Parårdha Of Brahma, the thirtieth Kalpa was
well-known as Pitr kalpa, In the beginning of the Svåyambhuva
Manvantara therein, you were (known as) Sati. O great goddess, the
Daksa who was then your father was born of prana, the patriarch. But
in this Manvantara, O goddess, Daksha was born Of Pracetas.
Now, O my beloved, Daksa Will be born Of the right (thumb). All the Brähmanas beginning With Daksa are born in every Yuga.
Thus bereaved of you formerly, O my beloved, I was separated from you till the Chakshusha Manvantara Of the Varähakalpa.
- This is the twenty-first Manu (i.e. beginning from Sväyambhuva Of Pitrkalpa and ending with of Väräha Kalpa) in the Kalpa called Väråha.
O great goddess, in every Kalpa you will have a different name.
- In this Väräha Kalpa, O goddess, you became Pärvati obtained by Himavän through his penance, when the Cäksusa Manvantara has passed
- O beautiful lady, due to the anger of Daksha you had to be separated from me for the duration Of a day Of Brahma. Your span of
life is the period of his six months.