16 hours is plenty much imo... AFAIK, there's no feel of a need to implement tissues with higher half-times than the current ones at around 12hours if I remember correctly. Getting significant saturation on such a tissue does not seem that easy to me. It's also a matter of "5 dives a day" or "1 dive a day". "A week of diving" means nothing.
Have you done an extensive study or can point to data to back this up?