When are the worst times of the week or day to make outbound telephone sales or telemarketing calls? Monday mornings are a waste of time, Friday afternoons don’t even bother. The first hour 9 – 10 is a bit fruitless and don’t try to get a decision-maker during school holidays. Summer holidays, July and August are also to be avoided. Most of December is a write-off to be honest. And so it goes. What does that leave? When is it best to hit the phones to reach your target prospect?