If a holder receives/transfers 70% of their current balance in a transaction, for example, their cycle will be extended by 50%. The duration of this extension is limited to the base cycle (12 hour). This behavior was implemented to prevent cycle abusers from buying before their cycle ends and/or selling immediately after receiving their rewards. So, in the same example, the holder would have its cycle extended for a total of 6 hours, and it would have its BNB claimed after 18 hours.