He does make an excellent point in that being loyal will get loyalty in return, but IMO.. I would rather have an excellent resource that can come in and make an immediate impact even for a year, than have someone that will just get by for 3 years. Imagine having someone like Calcanis work for your startup full time for just 6 months, think about the impact. I think time matters little. Also they bring a lot of varied experiences, and probably will be a real litmus test on how you are as an employer.