Shiva Purana
जपश्च मूलमंत्रस्य लक्षः परमसंख्यया ॥ एकावरा त्र्युत्तरा च पूजा फलवशादिह ॥ ४० ॥
The maximum number of times for Japa is hundred thousand. According to the benefit desired the number of worship varies from one to three.
english translation
japazca mUlamaMtrasya lakSaH paramasaMkhyayA ॥ ekAvarA tryuttarA ca pUjA phalavazAdiha ॥ 40 ॥
hk transliteration by Sanscript