Your question is impossible to answer without more information. Different crimes have different punishments, different ages get dealt with differently, and different jurisdictions deal with these matters differently. Basically, tho, depending on the crime and the circumstances and the age, they could be facing similar penalties to those of adults.
Your question is too vague to answer. Some crimes will net only a few months, others will earn them life in prison, they will remain in juvenile until they are old enough to be moved to adult prison.
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Your question is impossible to answer without more information. Different crimes have different punishments, different ages get dealt with differently, and different jurisdictions deal with these matters differently. Basically, tho, depending on the crime and the circumstances and the age, they could be facing similar penalties to those of adults.
Your question is too vague to answer. Some crimes will net only a few months, others will earn them life in prison, they will remain in juvenile until they are old enough to be moved to adult prison.