In my limited experience I have found most charges seem to have a margin of error built in and will never charge a battery to actual 8.4v
If a pack is slowly going further and further out of balance you could find it takes up to an hour or more to balance. If you are balancing out .05 of a volt that is likely to be a few hundred mah, chargers balance at like .1 amp so it's not unreasonable to think it will take a while.
If it where me, I'd leave them on balance and monitor them every 10 mins just for peace of mind.
And remember to always charge in an approved lipo sack.
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