We have a project that has multiple tasks and we are trying to show a roadmap / project plan. The challenge is that each task is very "long tailed", meaning that most of the task will get done in, let’s say 2 months, but then there is 5% of that task that will take much longer to close out (let’s say 9 months before every final bit is closed out) due to the complexities of some exception cases.
If I treat the whole thing as a single item going out 9 months, it doesn't reflect that breakdown. If I put 2 months, then it ignores that fact that it really won't get fully closed out for 9 months.
What is the best way to represent this type of task on a roadmap, project plan?