Can I change the duration of a banknote?

Durations of the banknote are how long the banknote will stay on the map ready to be picked up. You can set the duration when posting the banknote, by setting the timeframe to an appropriate amount of time for someone to reply to you.

At the moment the only way to change the duration of a banknote is by cancelling it and re-posting.

However, active deals (black banknotes) will last for up to six days, or until both parties mark the deal complete (whichever is sooner).