I had a 90-minute phone call with a customer this morning which left me with a weird feeling in my left ear (where the receiver had been) and eight pages filled with notes which I'm now in the middle of typing into the computer and sorting out a little.
After the phone call was done, I felt like "whew!". But it's been productive; I learned a fair bit about the job which we will have to do. I got answers to the questions I had and also background information that the customer volunteered himself, which was extremely useful.