Dear Ravi,
Om Sai Ram ...
Before you decide on how much prayer is good, you need to ask yourself what you aim to achieve through your prayers.
Remember, as you sow... so shall you reap.
So as much as you pray, that much shall you receive in return ....
An extreme form of prayer is nothing but penance. And this is the same penance or prayers that our great rishis and munis undertook in order to attain salvation or nirvana. And we know that not many were successful at this, right. Only a few chosen ones were fortunate enough to pray with such intense devotion, faith, discipline and single minded consciousness that the divine powers blessed them to attain salvation.
You would have definitely read about Gautam Buddha and his penance in order to attain salvation.
So how would you classify that prayer? Too much? extreme? unhealthy?
Then there are other prayers that are again of a very very intense order. Remember Savitri prayed with so much devotion that her dead husband had to be brought back alive.
Then there are other so many examples where the devotees have prayed with so much faith and devotion that the almighty or the satgurus have been so pleased as to appear before them and grant them a boon.
How would you classify these prayers? Too much? extreme?
In Kaliyug, there have been very very few swamis and satgurus who have prayed with such intensity to have attained enlightenment ... Sai Baba, Akkalkot Swami Samarth, Swami Narasimha Saraswati are some of them and they are also known as the avatars of Lord Dattatreya ...
So from my point of view, you need to decide first on what is your aim ... and what you wish to achieve in life.
Only once you know that for sure can you then decide how much of prayer is good.
As of us normal human beings, our desires are of very wordly in nature compared to the spiritual goals of the great beings above and i am sure that we need not have to go through such an extreme form of prayers for our desires to be fulfilled.
Maybe a lesser form of prayer can be enough.
However, even that cannot be guaranteed since we never know of our past sins and our past karmas. And hence we never know how much we need to pray for our past sins to be washed away and for our current desires to be fulfilled.
Most of us take for granted that we all pray with a lot of devotion and so all our desires must be fulfilled. But only the great beings like Satguru Sai Baba know of all the debts that we need to clear from the past before we can get our desires truly fulfilled in this birth. And so many times it leaves a lot of us confused when we do not see any result for our praying efforts.
Also in this kaliyug, there are hardly any human beings who are willing to let go of the wordly path and walk on the tough path for their spiritual desires to be fulfilled. Remember, Sai Baba has said that walking on the spiritual path is akin to walking on a razor's edge and so most of us normal human beings never really choose to follow this path seriously.
So, in the end .. just to summarize ... decide your aim in life and only then can you decide how much prayer is good.
But before you start praying, you can never decide on an exact number - that so many hours or so many months of prayer is good and any thing beyond that is extreme. That can never be pre-decided. That is known only to those great powers.
So you just have to start praying for your aim to be fulfilled.
And once you have attained your goal, one of two things will happen - either you will stop praying yourself since your goal has been achieved. So you yourself will not attempt praying what is more than necessary.
Or, there would be some divine intervention to let you know that the almighty has been pleased and so you need not pray any more. Even the almighty does not like to see his devotees pray more than what is needed for their desires to be fulfilled.
Either way, you will never be praying what is more than necessary or healthy for you.
So in a way, maybe it can be said that no amount of prayer is ever extreme or unhealthy.
Om Sai Ram ....