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The minimum safe overlap for a splice in your situation is 5' like previously mentioned.
Remember you cannot drill a hole less than 1.5" from the end of the cut lumber (2.5"-3" is much better) or from either edge. You will want the bolts staggered like HayZee has already mentioned as well.
Don't skimp on the waterproof glue either and apply it in a wiggly line fashion the full length of the replaced bearers.
If it were me, I'd replace the piece for the middle section and then replace the whole outer bearer (glued and bolted).
The way already described will do the job just as well though.
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