When encoding information, which of the five senses has been shown to be more durable and last longer in memory?

Olfactory memory tends to be the most durable. Surprisingly, smells tend to be the most strongly related with memories. This has been shown by people being able to associate smells with events for longer periods than any other sensory input. Most other inputs only stay in memory for a period of milliseconds, up to 2-4 seconds at the most.