What kind of prayer or chanting should be

 done to  the God  regularly

 in different places  and on different occasions. ?

Regarding to  the spirituality and devotion,

 no time is mentioned or allotted.

God is Sarvavyapi who is all pervader.

Even our Soul is also Bhagavan.

If we experience the Lord and the lord of

every being every where and all the time,

 definitely the man can become Paramatma

what our sacred scriptures say.

As we are human beings and also common men ,

 and also as we are living in this materialistic world,

 we follow the Karma maarga and Bhakti maarga. 

The Karma  must be Nishkaama karma and

 the Bhakti must be as lamenting for attaining the  God.

The God is Omnipresent, Omnipotent, and  Omniscient 

 and Satchidananda.

He is the indweller of all beings.

The God, Maadhava  is for all the times.

Our elders say, we should pray to the

Bhagavan on different occasions and actions.

We are all the Karma jeevas.

It is said in the Prayer sloka  in

“Oushadhe chintaye dwishnum, Bhojane cha Janaardhanam  ...” .

Means,

At the time of taking medicies, we

 have to pray for the Lord  Sree Vishnuh.

In the time of eating our food, we have

to do the prayer to the Lord Sree Janardanah.

While taking rest and going to sleep we

should pray to the Lord  Sree Padmanabhah.

At the time of marrying, we must

 pray for the  Lord, Prajapatih .

While we are in foreign places or if we are

exiled we should pray for the Lord, Sree Trivikramah.

At the time of leaving this mortal body

(Avasaana Dasa) we must pray to the Lord, Sri Narayanah.

While when we are with our beloved spouse,

we have to pray for the Lord, Sree Dharah.

When we experience any bad dreams,

 we must pray to the Lord, Sri Govindah.

While we are searching and living in the

 forest places, we should pray for the Lord, Sri Naarasimhah.

When we are in the middle of the water in any river ,

 or in the ocean , we must pray to the Lord, Sree Varahaswamy.

When we are wandering  on the mountains,

 we have to pray to the Lord, Raghunandanah.