The Gemara (Brachos 21.) says, אדם שיתפלל ולואי כולו היום כל, "Halevay a person would daven all day long!" How does one do that? Doesn't he have many other things to do?
Rebbe Bunim of Peshischa zy'a says that this means one should daven for everything that he is doing. One must recognize that he can't do anything without Hashem's help.
The Klausenberger Rebbe zt'l heard the following story from his father, Reb Tzvi of Rudnik zt'l:
There are two cemeteries in Krakow. Many ancient scholars are buried in the older cemetery, such as the Bach, the Megaleh Amukos, and the Rema. A local woman wanted to be buried in the older cemetery, but it was almost impossible to fulfill her wish. For hundreds of years, no one was buried in the old cemetery. Even the Rabbanim of Krakow were buried in the new cemetery. But this woman didn't give up. Three times a day, during shacharis, minchah, and maariv, she came to the beis knesses and davened that Hashem have compassion on her and that help her be buried in the old cemetery when her time came. She was so obsessed with this desire that all the children in Krakow knew to greet her, "Good morning, aunt. May you be buried in the old cemetery," as she had trained them to say.
At the weddings of her children, grandchildren, and great-grandchildren, she would ask the chasan and kallah to bless her that she be buried in the old cemetery.
It seemed absurd and peculiar to everyone why this was so important to her. Furthermore, it was almost impossible to be buried in the old cemetery. But she was persistent and stubborn with her desire.
On the day she left the world, there was a heavy snowstorm, and the ground was covered with high piles of snow. The chevrah kadisha couldn't carry her to the new cemetery, so they buried her in the old cemetery.
Reb Tzvi of Rudnik commented about this story, "This taught me that even when one davens for something that seems 'insane', Hashem will listen to his tefillos and answer them. Such is the great power of tefillah!"
Therefore, he should daven for success before each deed he tries to do. It will then be considered like he davened all day long. When he goes to work, he davens for success. Before performing chesed, he davens that his deed should have the proper impact on the recipient, and so on. When one prays for all the trivial and for all the significant things he does, he will be davening all day long.
This can be alluded to in the words (Tehillim 102:2), שיחו ישפוך 'ה ולפני יעטוף כי לעני תפילה, "A prayer for a poor man when he enwraps himself and pours out his speech before Hashem." With everything he does, he encircles it with a tefillah for Hashem. He knows he can't do anything without Hashem's aid, so he wraps all his deeds with tefillah.
The Divrei Chaim zt'l uses this pasuk to discuss a higher madreigah. He explains that even when one speaks to his fellow man, he can intend a prayer to Hashem in his words. He wraps all his conversations in a prayer.
The Chofetz Chaim zt'l (Likutei Amorim 10) teaches, "In addition to Shemonah Esrei, which one says three times a day, one should daven from the depths of his heart when he is alone in his house. The daily Shemonah Esreis is said by rote, and people don't think about what they say. But when a person is alone and thinks about his life and struggles, he will pour his heart out like water before Hashem and daven with kavanah. It will be a tefillah from the depths of his broken, humble heart, and such tefillos never go unanswered."
