When filtering for duration the slider jumps from 1 month to 6 months with no selections in between.
Even if you search globally there are basically no one posting 6 month sits that is an unrealistic length, whereas there are sits that are more than 1 month which would be helpful to filter.
So having the option to set 1 month, 2 month, then 3 month+ would be many many times more useful than having everything over 1 month in the same category.