Don't be nervous, if you run them carefully you might expect 7 days, Oups excuse me 7 years of service. To be serious, I just think that if you don't have problems at their begining, there's no reasons to have problems later.
Yes, just add eggs and bacon...Interstate recommends that on every charge cycle you bring them up to 15.5 31 62 volts for 2-4 hours! Equalization is 15.6 31.2 62.4 volts.
Don't follow Interstate recommendations and trust your hydrometer, it will be more accurate ... If they really had performed test on their batteries, they should know that one doesn't need these voltages to charge their batteries correctly.
I think they are right, 59.2V in winter and maybe a little 58.4/58.8V for summer with light discharge. 58.4V absorb/2hr with EA set to 4A (415Ah) will give you around 1.275SG everyday without consumming too much water. But if you need corrective EQ, you'd better use 64V for x hours (Rolls recommend the higher voltage your inverter/controller can supply).The installers around here recommend 14.8 29.6 59.2 volts for absorb. (I use 29.6 on my bank).
Good luck and keep cool