To my limited knowledge, phaleanopsis orchids tend to have the longest lasting flowers. Depending upon the species, some may have a scent.
Another one with really long lasting flowers but no scent is the Dendrobium cuthbertsonii, however it can be very difficult to grow. If you can grow it, data suggests the flowers can last between 6 to 8 months.
If you are searching for orchids that will be consistently in flower, you might try searching for orchids that are sequential bloomers such as the Psychopsis. I don't believe they have a scent however.
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