I have never understood people who ask you to take care of something and then they want to keep you on the line while they think out loud.
Dude, you give me something to do, I jump on it to get it fixed. I don't want to listen to you sit on the phone and go "Uhhhhhhhhh..."
Hang up, let me go and I will get it fixed and call you back. Further conversation is meerly wasting time which is precious (not to mention billable). Once we make a quote that says I have X amount of time to do a job, I will get it done in X amount of time.