The reason we selected 5 years as an upper limit was to account for Native OCs (only one in presently, but several other players have expressed interest), which do not have extended lifespans; similar to several mod-controlled NPCs which will have key points in the metaplot. Furthermore, planning and coordinating ten years of mostly-handwaved character development is a lot of work, especially for characters who have a lot of cr or investment in local politics.

If you can get at least 5 other players to comment here requesting a greater higher limit, we'd consider adding an option for 10 years to those stated above.