What happens when a contact is stuck in pending for 24+ hours

Max_Garrett2
Level 1

What happens when a contact is stuck in pending for 24+ hours

in my reports I have contacts that are pending.  through the reading is sounds like they get bounced, but it does not say what kind of bounce - hard or soft.  if they get soft bounced does that mean that Marketo will try to send them for another 24hrs?  if those fail do they turn into hard bounces?