In much of the orthodox world, davening doesn't take nearly as long as you describe. My experience (as an orthodox rabbi teaching in a Conservative day school) is that in the Conservative world, where shabbos davening may be the only traditionally "Jewish" thing that one does during the week, it's extended into a half-day long affair. All of this is beside the point, however. Before we take away from the hour/day spent in prayer in order to work on tikun olam, how about we deduct from the two hours/day spent in front of the television, or the three hours/day spent surfing the internet? Why does the author feel that prayer and tikkun olam are mutually exclusive?
from the article: Jews pray too much