Online marketing has evolved from selling products to creating engaging experiences for consumers. New research shows that how long these experiences seem to last, however, depends on how rich the experience and time of recall (Ahn, Liu, and Soman 2009). The “memory marker” model helps explain this phenomenon and the time distortion that some people experience during and after immersive online flow experiences. Web developers need to balance the need to create rich online experiences with tolerable download times and scant distractions.