An interesting, and very true quote from Soren Kierkegaard:

"The immediate person thinks and imagines that when he prays, the important thing, the thing he must concentrate upon, is that God should hear what he is praying for. And yet, in the true, eternal sense, it is just the reverse: the true relation in prayer is not when God hears what is prayed for, but when the person praying continues to pray until he is the one who hears, who hears what God wills. The immediate person, therefore, uses many words and, therefore, makes demands in his prayer; the true man of prayer only attends."

Time spent listening in prayer is always as productive or more productive than time spent talking.