How long would it take you to make a £500k decision? The fact is, selling consulting services takes time -- you're not selling ice cream cones. The higher up the value chain you go, the more people internally there are that need to be convinced of the value you'll bring.In terms of getting to 'yes' quickly, there are a number of things to bear in mind:1. Make sure each meeting gets you closer to 'yes'. Good conversations are very pleasant, but don't help convert into sales.2. Ensure you've got a burning platform. Don't waste time pursuing sales that aren't on the forefront of your clients' agenda.3. Realise who the economic buyer is. You can spend ages having good conversations (see above) with people who don't have control over the consulting spend.4. Understand when to walk away -- not all business is worth pursuing. 'Slow burn' is good to keep in the background, but should never make up the majority of your consulting portfolio.There are any number of books about selling high-value services that offer good coaching around the sales cycle and expediting it.