Bermudagrass takes 10-30 days to germinate under ideal situations (adequate warm-moist 70+ degree soil conditions). Some seeds germinate faster and some take months longer. Hulled seed generally germinate faster than un-hulled Bermuda seed. It all depends on the soil and climate for the period after you plant. Bermudagrass loves hot moist soil to germinate. That is when it will germinate the fastest. Keeping adequate moisture throughout the day is also a critical factor. Watering more than once a day may be a requirement of your lawns soil & weather.
Bermudagrass seeds have a tough outer hull that can reduce germination time. Hulled seed have this seed coat removed and can be more desirable in many cases where the weather may be the important factor in establishment of the lawn, pasture or hay field. Sometimes hulled and unhulled seed will be sown together to insure a more successful and surer establishment. Most lawn varieties sold of Bermuda seed are coated and hulled. The coating is a clay based product applied with a fungicide and dye. The fungicide helps control seed and soil borne pathogens, while the coating material itself allows for more acceptable pricing of expensive seed. Raw seeds are seeds that have NOT been coated. Other than the lack of a fungicide there are nothing wrong with these seeds.