"When I pray, I pray quickly, because I am talking to God; but when i read the Torah, I read slowly, because God is talking to me."
By Hebrew saying
"Our prayer ought to be short and pure, unless it happens to be prolonged by inspiration of divine grace. In community, however, let prayer be very short."
By St. Benedict
But some still pray very long especially in public assemblies, i prefer it KISS - Keep it short and sweet.