I would leave the tang as long as possible, as long as you don't have to drill too far into your last handle section. Personally, I usually prefer to have the tang all the way through and rivetted, so as not to rely entirely on the adhesive, but that isn't really necessary with modern epoxy glues.
Having recently removed a handle from blade due to a mistake it took nearly an hour of boiling (to soften the glue) and considearble force to remove the handle I am confident in my construction methods.
The length of the tang in this drawing is accurate as made by a top bladesmith is about 70 mm
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