Charging at 5amps (approx the recomended 1C) then to put 5200 into the battery should take approx an hour, but you will never charge from flat, so always less than an hour at 5amps depending how much is in the battery when you start.
On a 'slow' charge - say 1amp a lot longer, but why bother ?
Balance charge seems to take longer
Something to play with
http://www.csgnetwork.com/batterychgcalc.html