Planning Poker is one of the most popular Agile practices. It's quick, accurate and fun as well. Sometimes however, it just takes too much time, especially when estimating initial backlog with a new team. When your customer is not happy with No Estimates approach it's time to look for an alternative. Something which would give you a rough estimate of the whole project in an hour or less.
One of the techniques I've used several times with different teams and in different projects is a Silent Sort approach for Product Backlog estimation. Join me if you'd want to learn how to provide your customer with initial estimate in less time than it takes to listen to this talk.
First time presented at Agile By Example 2015 conference.