Open Monday - Friday: 04.45 - 23.15, Saturday: 05.15 - 23.15, Sunday: 05.15 - 23.15.
Ticket sale (Narvesen) open Monday - Friday: 05.30 - 22.00, Saturday: 07.30 - 19.30, Sunday: 08.45 - 22.00.
There are also ticket vending machines.
Tønsberg station is situated in middle of the city centre. From Tønsberg there are regional train services towards Oslo, Lilleammer and Larvik/Skien.
You can read more about Tønsberg here: http://www.visittonsberg.com/en