It all depends on circumstances of his case. The bond is initially set by ICE/DHS and depends on many factors; also there are situations in which a person is not eligible for a bond. If the person signed voluntarily departure, than he can be released for up to the time agreed with the ICE/DHS.
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This matter depends on what are the felonies involved and what type of immigration relief he would be eligible for. However, if the individual signed (since you said agreed) a form requesting deportation, then it would be very difficult to obtain a bond given that he essentially consented to deportation and it usually involves a waiver of removal proceedings. While this does not automatically bar the individual from being able to obtain a bond, it does make it more difficult.
Up to ICE. May take several months
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