Charge is always less than 100% efficient so you will have to put in about 120 to 160 % of the capacity, in your case either 444 to 592 devided by your charge rate of 25 or 17.7 to 23.6 hours for a fully discharged battery. You would be best off to do this while you can monitor the batteries temperature and, if you find the temperature to start rising much above ambient, stop the charge as the battery is full and any further charge could build up enough enternal pressure to blow the vents which will severely limit the lifetime of the cells.