शुक्र (Shukra) पूजा -

For the appeasement of Shukra (Venus), the recommended japa count varies, with 16,000 to 20,000 repetitions commonly cited for a complete mantra cycle (purascharana).
However, the tradition for the Kali Yuga multiplies this count to 64,000 repetitions for the full benefit.

Shukra Beej (Seed) Mantra -
Om Dram Dreem Droum Sah Shukraya Namah
(ॐ द्रां द्रीं द्रौं सः शुक्राय नमः)

Shukra Gayatri Mantra -
Om Bhrigu-vansha-jaataaya Vidmahe, Shveta-vaahanaaya Dhimahi, Tanno Shukrah Prachodayaat
(ॐ भृगु-वंश-जाताय विद्महे, श्वेत-वाहनाय धीमहि, तन्नः शुक्रः प्रचोदयात्)