Secular booms can last up to 20 years and we're in one right now, says Federated Investors' Duessel

Linda Duessel, Federated Investors senior equity strategist; Sarat Sethi, Managing Partner at Douglas C. Lane and Associates and CNBC's Mike Santoli join the 'Squawk Box' team to discuss the bull market and if they're worried.
Tue, Aug 21 20187:07 AM EST