Criar uma conta para um cartão Oyster só mostrará as últimas oito semanas de viagem . Após esse período de oito semanas, os dados são anonimizados. No entanto, se o cartão tiver sido usado irregularmente, pode haver alguns dados mais antigos no próprio cartão , de acordo com a TFL:
We retain data about the individual journeys made using your Oyster card for eight weeks after the card is used. After eight weeks, the journey data in the ticketing system is disassociated from your card (ie anonymised). This eight-week period is considered reasonable to enable customers to verify or make enquiries concerning their journeys (for example, for refund purposes).
Customer names and contact information associated with a registered Oyster card will be retained for two years after the card was last used or had a season ticket or pay as you go credit added.
Some journey information is also stored on the Oyster card itself; this comprises the last eight journeys and related charges, up to three season ticket products, (generally the most recent three tickets, including future dated), and the last two incomplete journeys. If you are an irregular user of your Oyster card, the data stored on the card may be older than eight weeks.