You can rent these implements from rental stores in your area. This compacts the soil around the seed, creating a more favorable environment for Bahiagrass seed germination. The rolling also smoothes the soil providing for a more level lawn and a later beautiful turf. Some seeds germinate faster and some take months longer. It all depends on the soil and climate for the period after you plant.
Centipede grass loves hot wet weather to germinate.
That is when it will germinate the fastest. Secondly , keep in mind that these plants are much like a child. When a child is conceived it generally takes 9 months to emerge. Same with Centipede grass, except it only takes 4-6 weeks if conditions are right. Once it has germinated and emerged, it is only a baby in the plant world.