But you, when you pray, go into your room, and when you have shut your door, pray to your Father who is in the secret place; and your Father who sees in secret will reward you openly. Matthew 6.6
I think it is a form of bragging about your own spirituality when you tell people how often you pray.
It seems to me that a lot of people are quick to admonish others to pray. I'm sorry, but to me this is a pseudo form of spirituality. We are called to be a community of believers. When we admonish each other to pray, it sounds like we are being spiritual. But often i think it covers up the fact that we don't want to deal with the uncomfortable - death or loss of jobs or addiction or alcoholism or children in trouble or serious illness. It is uncomfortable to recognize that we are not able to "fix this" for each other, and since we can't "fix it," it is uncomfortable to have to listen to the pain another person is feeling. So telling that person to pray is a quick and easy "fix." Then we can walk away patting ourselves on the back that we were properly Christian about the whole thing.