Yes, tooth filling is usually completed in one session, approximately 30 minutes to 1 hour. The procedure time may vary depending on the size of the decay and the type of filling. Composite bonding is similarly applied quickly, in a single session.

Not eating until the numbness passes: Local anaesthesia is usually applied during filling. Take care not to eat anything before the numbness passes, because in this case you may unintentionally bite your tongue or cheek.
Avoid hard foods for the first 24 hours: It may take some time for the filling material to fully harden. Therefore, avoid hard, sticky or hard-to-chew foods (such as chewing gum, caramel) that may strain the filling.
Beware of Hot and Cold Sensitivity: Your tooth may be sensitive to hot or cold food/drinks for a few days after the filling. In this case, staying away from extremely hot or cold things will make you comfortable.
Paying Attention to Oral Hygiene: Continue brushing and flossing as normal, but be careful not to put too much pressure on the filling area.
Consulting a Dentist in Case of Pain or Discomfort: Mild sensitivity is normal, but if there is severe pain after filling, dislocation of the filling, or a sharp edge sensation, consult your dentist immediately.
Going for a Check-up: If your dentist has scheduled a check-up appointment, do not neglect to keep it.