Actually, Jesus Rosales-Ruiz and other skilled trainers demonstrated that if there was a delay as short as 5 seconds between the marker and the reinforcer, unwanted displacement behaviors would crop up and contaminate the training, even with very highly trained animals, thus making most clicker trainers suggest no more than a 3 seconds delay between the marker and the delivery of the reinforcer.

http://www.clickertraining.com/node/65