When you chant it during Sun on Moon Eclipse it will be 10,000 times powerful. Normally a mantra if chanted between 9.30 pm to 3 am the power of the mantra increases at least 10 fold and it is chanted on no Moon or full Moon night it is 100 times more powerful.But when it is chanted on Dussehra of Diwali day it is 1000 times powerful. In all cases, chanting any mantra during Brahma Muhurta and followed by the entire day till evening is good for majority of mantras. However it depends on the seeker's spiritual nature and the initiation he/she got that determines which mantra and procedure will yield fruit. Shri Krishna mantras will have the same effect, no matter the time and place. Once initiated, it is completely on the Guru to set all rules and procedures relating to invoking a mantra which he/ she may have achieved siddhi in.

That is the reason it is generally advised to chant mantras during the day time when it comes to shakti mantras unless properly initiated and your Guru specifically outlines the time. During night, any shakti mantra will have tamasic nature. When chanting a mantra, you are invoking the deity. The time of chanting a mantra is important for all other deities. All mantras of Krishna can be chanted at any time, any place by any one. Lord Venkatesha, is considered to be one of the forms of Lord Vishnu or Krishna. The divine idol was near exactly like how shown in the picture above. I stood in wonder thinking that I was praying all this long to none other than him, secretly and sincerely seeking His blessings for securing my admission, and here it was that I just secured my admission and He revealed himself immediately, as if to confirm my faith and made me feel like it was He, the divine wirepuller whose Grace was at work behind the scenes and fulfilled my prayer, while bestowing on me an experience I can never forget. In front of me was a majestic life size idol of none other than Lord Venkateshwara, standing inside a serene shrine with an enclosure.

I started walking and once I reached the end I was wonderstruck and left speechless.

There was some light at the end near by the wall, something nudged me to go towards the end of the corridor. When I was about to leave that building, by chance I happened to see a long and clean corridor or a hallway. By the end of 2–3 months I secured admission and while I was about to leave the College campus, visited a near by building to submit some documents. I chanted the stotra everyday for at least 1 and 1/2 months. I have the fortunate experience of chanting this divine stotra while I was seeking admission to a renown college for graduation.

Shri venkatesh stotra in marathi