A grant of voluntary departure gives you either 60 or 120 days to leave the United States. If you fail to depart you can be fined up to $5000 and you will have a 10-year bar to several types of immigration benefits, including adjustment of status. If you leave after the specified time, you will be considered deported and barred from returning to the United States for 5, 10, or 20 years or even permanently. If you do not leave the U.S. the voluntary departure order automatically become a deportation order and you can be picked up by immigration officials and deported, without first seeing a judge.