Kisame himself can absorb chakra, so does his juitsu, so can his former blade.
Not sure what the limit is because there are wierd factors that I dont think people consider(or it just dosent make sense). If the 10 tailed beasts strength is not evenly distributed between the tailed beasts. Then 6 tails worth of 8 tailed beast demon chakra isnt the same as 6 tails of 9 tails chakra. I dont think any(kisame,his juitsu,or his blade) could absorb the full amount of chakra a biju contains.Takes 9 people 3 days to seal the one tailed beast into the demon statue.