There are cheap places that offer dentures in a day, or a few days but you wouldn't want to go to one of these places. When your teeth are pulled your bone has to remodel which takes several months. This guarantees that dentures done shortly after getting your teeth pulled will not fit.
Generally, the dentist will take a preliminary impression, that is used to make a custom tray. This custom tray is used to make a final impression. Then the dentist will make rims that shows the lab where the teeth should go. The lab uses the final impression plus the rims to make a wax try-in that has teeth so the dentist can make sure the teeth are where they are on the denture and the patient approves. Once the wax try-in is adjusted by the dentist, the lab takes it and makes the actual denture for the patient. It generally takes several appointments.
Generally, the dentist will take a preliminary impression, that is used to make a custom tray. This custom tray is used to make a final impression. Then the dentist will make rims that shows the lab where the teeth should go. The lab uses the final impression plus the rims to make a wax try-in that has teeth so the dentist can make sure the teeth are where they are on the denture and the patient approves. Once the wax try-in is adjusted by the dentist, the lab takes it and makes the actual denture for the patient. It generally takes several appointments.