If someone is unconscious, don't give them a cup of tea.
"Where's George?"
"He's having a cup of tea"
Sometimes, people agree to having a cup of tea. But then, when the tea is ready, they might realise, that they don't want it anymore. Sure, that sucks, but you wouldn't force them to have a cup of tea.
1) "This procedure we just took you through will now result in you waiting around for a bit, so rather than sitting around twiddling your thumbs watching the computer think, why not take a break away from your workstation instead?"
2) "This procedure or anecdote we are about to take you through will take a bit of time. Now is a good time to take care of whatever you feel is necessary before we proceed, because interrupting for one reason or another, emergencies barred, would be a not so good thing."
Comes mostly from technical documents, specifically where compiling is involved, as sometimes the process of compiling code takes a while.
"I'm going to be working on your computer for a while, James," Jerry said to the auditor as he frobbed some drivers. "Best go get yourself a cup of coffee