NKJV - 4 So Moses cried out to the LORD, saying, "What shall I do with this people? They are almost ready to stone me!
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Exodus 17:4 explains that Moses mildly answered them. It is folly to answer passion with passion; that makes bad worse. God graciously appeared to help them.
Jesus give us an example on tine in prayer being one hour. We are not hear by our many words right? I work getting up extra early is hard; with this in mind do we have to pray for an hour? ten, fifteen mints should be good enough right.
Thinking about Luke 18:11 I assume God hears what is said in one's heart. Otherwise how would people who are born deaf and mute pray? But I suppose that in the above context it was audible.